An opening and closing mechanism for a knife switch

Abstract

The present invention relates to an opening and closing mechanism of a knife switch, which includes a handle, a lever plate, a first rocker, a guide rail device, a pulley assembly, a sliding plate, a second rocker, a first support seat and a knife switch. The handle is movably connected to one end of the first rocker through the lever plate. The middle part of the lever plate is movably connected to the first support seat. The pulley assembly includes a pulley shaft and pulleys installed at both ends of the pulley shaft. The pulleys are slidably arranged in the sliding grooves of the guide rail device. The pulley shaft is movably connected to the other end of the first rocker, and the pulley shaft is installed at one end of the sliding plate. The other end of the sliding plate is movably connected to the knife switch through the second rocker. The advantage of the present invention is that the height of the handle is reduced through the mechanism movement among the lever plate, the rocker and the sliding plate, avoiding the need for workers to use climbing tools to turn the handle, and reducing the force required to open the knife switch through the lever principle, thereby improving the work efficiency.

Description

Technical Field

[0001] The present invention belongs to the field of mechanical technology, and relates to an opening and closing mechanism of a new type of knife gate, specifically an opening and closing mechanism of a knife gate device for a large chain stopper with a chain diameter of more than 100 mm. Background Art

[0002] The knife gate is a commonly used component of a roller knife gate chain stopper, mainly used to close when the ship is sailing or at anchor, clamp the anchor chain, prevent the anchor chain from slipping out, so as to play a role in chain stopping. At the same time, the holding force generated by the anchor and the anchor chain is directly transmitted to the hull through the chain stopper to reduce the load on the windlass and protect the windlass. The existing roller knife gate chain stoppers generally are equipped with a balance weight, and a handle is provided on the balance weight. When in use, the opening and closing of the knife gate is realized by pulling and pushing the handle.

[0003] The existing roller knife gate chain stopper makes the center of gravity of the knife gate deviate towards the pin shaft end hinged with the thrust plate through the counterweight of the balance weight, so as to reduce the force applied by the operator at the handle end through the lever principle. However, as the chain diameter of the anchor chain increases, the volume of the chain stopper also increases accordingly, resulting in a continuous increase in the height of the handle. The operator needs to use climbing tools to operate the handle. At the same time, the weights of the required matching knife gate and balance weight are also continuously increasing, and the operator may encounter difficulties in pushing or even be unable to push the knife gate when closing it. Summary of the Invention

[0004] The purpose of the present invention is to propose an opening and closing mechanism of a knife gate that is convenient and labor-saving to operate and has high working efficiency in view of the defects existing in the prior art.

[0005] To achieve the above purpose, the present invention provides an opening and closing mechanism of a knife gate, including a handle, a lever plate, a first rocker, a guide rail device, a pulley assembly, a sliding plate, a second rocker, a first support seat and a knife gate. The handle is movably connected to one end of the first rocker through the lever plate, the middle part of the lever plate is movably connected to the first support seat, the pulley assembly includes a pulley shaft and pulleys installed at both ends of the pulley shaft, the pulleys are slidably arranged in the sliding grooves of the guide rail device, the pulley shaft is movably connected to the other end of the first rocker, and the pulley shaft is installed at one end of the sliding plate. The other end of the sliding plate is movably connected to the knife gate through the second rocker.

[0006] The present invention removes the balance weight installed on the conventional chain stopper blade, and reduces the height of the handle through the transmission of the crank-slider mechanism. Workers only need to stand on the deck and pull the handle without borrowing any climbing tools to realize the opening and closing of the blade. The crank-slider mechanism includes a lever plate, a first rocker, a pulley assembly, a sliding plate, a second rocker and a blade. At the same time, the force required to open the blade is greatly reduced through the principle of leverage twice, and all operations can be realized by only one person, saving manpower and solving the problem that it is difficult to close the blade due to the excessive weight of the balance weight of the conventional large chain stopper. Furthermore, while improving work efficiency, the length of the blade is reduced, and the total weight of the new blade and the opening and closing mechanism is still less than that of the conventional chain stopper blade device, reducing the weight of the chain stopper and saving materials.

[0007] The present invention further adopts the following technical solutions:

[0008] Preferably, one end of the blade has a protrusion that can contact the chain.

[0009] Preferably, one end of the lever plate is hinged to one end of the first support seat, and the other end of the first support seat is installed on the side plate of the chain stopper.

[0010] Preferably, a pin is provided in the middle of the lever plate, and the pin is detachably connected to the limit hole on the second support seat.

[0011] With the above structure, when the blade is opened to a specified angle, the blade is fixed at the specified position by inserting the pin into the limit hole of the second support seat to play a limiting role. When closing the blade, the pin can be taken out from the limit hole, and the blade can be closed under its own gravity.

[0012] Preferably, the second support seat is installed on the deck.

[0013] Preferably, the guide rail device includes a bottom plate, a top plate and two guide rails arranged between the bottom plate and the top plate, and the guide rails have sliding grooves.

[0014] Preferably, the guide rail is composed of two vertical bars, and the gap between the two vertical bars forms a sliding groove.

[0015] Preferably, two upper and lower pulley shafts are installed at the lower part of the sliding plate, and the two upper and lower pulley shafts respectively pass through the shaft holes on the sliding plate and are connected to the pulleys arranged in the sliding grooves; both ends of the lower pulley shaft are respectively connected to a first rocker.

[0016] Preferably, the first rocker is connected to the lever plate through a pin shaft.

[0017] Preferably, the sliding plate is movably connected to one end of the second rocker through a pin shaft, the other end of the second rocker is movably connected to one end of the knife gate through a shaft, the other end of the knife gate is movably connected to the chain arrester through a pin shaft, and the lever plate is movably connected to the first rocker and the first support seat respectively through pin shafts.

[0018] The advantages of the present invention are that the height of the handle is reduced through the mechanism movement among the lever plate, the rocker and the sliding plate, avoiding the staff from using climbing tools to turn the handle, and reducing the force required to open the knife gate through the lever principle, thereby improving work efficiency. Brief Description of the Drawings

[0019] The present invention will be further described below with reference to the drawings.

[0020] Figure 1 is a three-dimensional structural schematic diagram of the present invention.

[0021] Figure 2 is a side view of the present invention.

[0022] Figure 3 is Figure 2 a sectional view taken along line B-B of

[0023] Figure 4 is Figure 2 a sectional view taken along line C-C of

[0024] Figure 5 is an installation schematic diagram of the knife gate opening and closing mechanism of the present invention.

[0025] Figure 6 is Figure 5 a sectional view taken along line A-A of

[0026] In the figure: 1. Handle, 2. First support seat, 3. Lever plate, 4. First rocker, 5. Knife gate, 6. Pin shaft, 7. Second rocker, 8. Shaft, 9. Sliding plate, 10. Pulley, 11. Pulley shaft, 12. Guide rail device, 13. Pin, 14. Second support seat, Ⅰ. Chain arrester, Ⅱ. Knife gate opening and closing mechanism. Detailed Embodiments Embodiment 1

[0027] As Figures 1 to 4As shown in the figure, a switching mechanism for a knife switch includes a handle 1, a lever plate 3, a first rocker 4, a guide rail device 12, a pulley assembly, a sliding plate 9, a second rocker 7, a first support seat 2, and a knife switch 5. There are two pulley assemblies, both of which are installed at the lower part of the sliding plate 9. Each pulley assembly consists of a pulley shaft 11 and pulleys 10 installed at both ends of the pulley shaft 11. The pulleys 10 are slidably arranged in the sliding grooves of the guide rail device 12. The handle 1 is movably connected to one end of the first rocker 4 through the lever plate 3. The middle part of the lever plate 3 is movably connected to the first support seat 2. The other end of the first rocker 4 is movably connected to the pulley shaft 11 of the lower pulley assembly. The pulley shaft 11 is installed at one end of the sliding plate 9. The other end of the sliding plate 9 is movably connected to the knife switch 5 through the second rocker 7. One end of the knife switch 5 has a protrusion that can contact the chain. In this way, a protrusion structure is added to the contact end of the knife switch 5 with the chain, while the thickness of the protrusion at the other end is reduced. After the knife switch 5 is closed, the protrusion at the front end of the knife switch 5 contacts the chain, playing a role in chain restraint. The position of the knife switch 5 in the chain arrester I moves forward as a whole, leaving sufficient space for the installation of the switching mechanism. The installation relationship between the knife switch switching mechanism II and the chain arrester I is as Figure 5 and Figure 6 shown.

[0028] The guide rail device 12 includes a bottom plate, a top plate, and two guide rails arranged between the bottom plate and the top plate. Each guide rail has a sliding groove. The bottom plate is welded to the side plate of the chain arrester I. The guide rail is composed of two vertical bars. The gap between the two vertical bars can form a sliding groove. A pulley 10 that can slide up and down along it is arranged in the sliding groove. The pulley 10 is connected to the pulley shaft 11 passing through the shaft hole on the sliding plate 9. Both ends of the lower pulley shaft 11 are respectively connected to a first rocker 4, so that one end of the first rocker 4 is hinged to the lower end of the sliding plate 9 through the pulley shaft 11. The other end of the first rocker 4 is hinged to one end of the lever plate 3 through a pin shaft 6. The middle part of the lever plate 3 is hinged to one end of the first support seat 2 through a pin shaft 6. The lever plate 3 is welded to the handle 1. The other end of the first support seat 2 is installed on the side plate of the chain arrester I. The upper end of the sliding plate 9 is hinged to one end of the second rocker 7 through a pin shaft 6. The other end of the second rocker 7 is movably connected to one end of the knife switch 5 through a shaft 8. The other end of the knife switch 5 is movably connected to the chain arrester I through a pin shaft. In addition, a pin 13 is provided in the middle of the lever plate 3. The pin 13 is detachably connected to the limit hole on the second support seat 14. The second support seat 14 is installed on the deck.

[0029] The present invention is mainly used for chain engagement and release of large roller knife chain stoppers with a chain diameter of more than 100 mm. During use, one end of the knife 5 is hinged to the chain stopper I through a pin shaft, and the other end is hinged to the second rocker 7 through a shaft 8. The second rocker 7 is successively hinged to the sliding plate 9, the sliding plate 9 to the first rocker 4, the first rocker 4 to the lever plate 3, and the lever plate 3 to the first support seat 2. The first support seat 2 and the guide rail device 12 are fixed to the two side plates of the chain stopper I by welding. The second support seat 14 is welded to the deck and cooperates with the pin 13 to play a limiting role after the knife 5 is opened. The degree of freedom of the mechanism F = 3×5 - 2×7 = 1. Therefore, with the lever plate 3 as the starting component, the mechanism has a completely determined motion. When opening the knife 5, press down the handle 1, and through the transmission of the lever plate 3 and the first rocker 4, the sliding plate 9 moves upward on the guide rail device 12 through the pulley 10, and then drives the knife 5 to open through the transmission of the second rocker 7. When the knife 5 is opened to the specified angle, insert the pin 13 into the limiting hole of the second support seat 14, so as to fix the knife 5 at the specified position. When closing the knife 5, take out the pin 13 from the limiting hole of the second support seat 14 and put it into the storage hole on the second support seat 14, and the knife 5 can be closed by its own gravity. The sliding plate 9 is driven to move by the rolling of the pulleys 10 installed on both sides of the sliding plate 9 on the guide rail device 12, reducing the friction force and making the mechanism operate more smoothly.

[0030] In addition to the above embodiments, the present invention can also have other implementation manners. All technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention.

Claims

1. An opening and closing mechanism for a knife switch, characterized in that: It includes a handle, a lever plate, a first rocker, a guide rail device, a pulley assembly, a sliding plate, a second rocker, and a first support seat. The handle is movably connected to one end of the first rocker through the lever plate. The middle part of the lever plate is movably connected to the first support seat. The pulley assembly includes a pulley shaft and pulleys installed at both ends of the pulley shaft. The pulleys are slidably arranged in the sliding grooves of the guide rail device. The pulley shaft is movably connected to the other end of the first rocker, and the pulley shaft is installed at one end of the sliding plate. The other end of the sliding plate is movably connected to the knife gate through the second rocker.

2. The opening and closing mechanism of a knife switch according to claim 1, characterized in that: One end of the knife gate has a protrusion that can contact the chain.

3. The opening and closing mechanism of a knife switch according to claim 1, characterized in that: The lever plate is hinged to one end of the first support seat, and the other end of the first support seat is installed on the side plate of the chain stopper.

4. The opening and closing mechanism of a knife switch according to claim 1, characterized in that: A pin is provided in the middle of the lever plate, and the pin is detachably connected to the limit hole located on the second support seat.

5. The opening and closing mechanism of a knife switch according to claim 4, characterized in that: The second support seat is installed on the deck.

6. The opening and closing mechanism of a knife switch according to claim 1, characterized in that: The guide rail device includes a bottom plate, a top plate, and two guide rails arranged between the bottom plate and the top plate. The guide rails have sliding grooves.

7. The opening and closing mechanism of a knife switch according to claim 6, characterized in that: The guide rail is composed of two vertical bars, and the gap between the two vertical bars forms a sliding groove.

8. The opening and closing mechanism of a knife switch according to claim 6, characterized in that: Two upper and lower pulley shafts are installed at the lower part of the sliding plate, and the upper and lower pulley shafts respectively pass through the shaft holes on the sliding plate and are connected to the pulleys arranged in the sliding grooves; both ends of the lower pulley shaft are respectively connected to a first rocker.

9. The opening and closing mechanism of a knife switch according to claim 8, characterized in that: The first rocker is connected to the lever plate through a pin shaft.

10. The opening and closing mechanism of a knife switch according to claim 1, characterized in that: The sliding plate is movably connected to one end of the second rocker through a pin shaft. The other end of the second rocker is movably connected to one end of the knife gate through a shaft. The other end of the knife gate is movably connected to the chain stopper through a pin shaft. The lever plate is movably connected to the first rocker and the first support seat respectively through pin shafts.

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