JPH0229389B2 - SHASHUTSUKANONAGURIISUOSHIDASHISOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an injector for injecting grease into mechanical devices during maintenance and inspection of various mechanical devices.

[Prior Art] Conventionally, grease guns have been generally used to apply grease to various mechanical devices, etc. Grease guns that push out grease at low pressure usually use a manually operated piston to push out the required amount of grease and apply it to the required location. When applying or injecting grease to a surface and injecting the grease under high pressure, a manual grease gun or a grease gun that injects grease using compressed air is used.

Although the JIS standard stipulates that the maximum grease discharge pressure exceeds 100 kg/cm ² , today, with the advancement of various mechanical devices, the grease injection pressure has increased to a high pressure of 500 kg/cm ² or more. In many cases, injection devices using compressed air are required.

This grease injector enables high-pressure injection of grease using a piston using low-pressure compressed air of 10 kg/cm ² or less.
As shown in Figure 0, the grease in the grease tank 18 is transferred to the cylinder room 3 by a spring 19.
5, so that compressed air can be sent into the rear chamber 34 of the piston in the piston room 31, and a plunger 36 provided in the cylinder room 35 is integrated with the piston. A check valve 38 is provided at the tip of the cylinder room 35 to prevent the extruded grease from flowing back when the plunger 36 retreats, and to prevent the grease from flowing back into the cylinder room 35 after the plunger 36 retreats. The amount of grease applied is set at a predetermined level.

[Problems to be Solved by the Invention] As mentioned above, in conventional high-pressure injectors, grease is automatically sent to the cylinder room by the pressing force of a spring, etc., and a predetermined amount of grease is always injected at high pressure. The amount of grease required varies widely depending on the mechanical device that performs grease up and the location where grease is injected, and injecting more than necessary grease may adversely affect the operation of the machine. However, it has been difficult to inject an appropriate amount of grease using a high-pressure injector.

In addition, when it comes to greasing mechanical equipment, the locations where grease is usually required are complex, and are not limited to cases where high-pressure lubrication is required, such as when adjusting the tracks of construction machinery. There are parts such as sliding surfaces that require continuous low-pressure lubrication, such as applying grease. There are many cases in which it is necessary to apply grease, and there is a drawback that maintenance such as grease build-up requires time and effort, and in particular, there is no suitable tool that can perform continuous application of grease.

[Means for solving the problem] The present invention is a low-pressure extruder that extrudes grease using compressed air stored in an air room for low-pressure extrusion, and the extruder is provided with a cylinder room and a piston room for high-pressure injection. A branch channel is provided from the grease extrusion channel that communicates the extrusion outlet of the low-pressure extruder with the grease cassette to the cylinder room for high-pressure injection, and a closable throttle valve is provided near the extrusion outlet, and the branch channel can also be closed. A throttle valve is provided so as to be able to send compressed air to the air room for low-pressure extrusion, and also to a rear chamber in the piston room for high-pressure injection, and a cylinder disposed in front of the piston room. A spring integrated with the piston in the piston room is provided in the cylinder room, and an injection outlet with a check valve is provided in front of the cylinder room, and the grease in the grease cassette is pushed out by opening the throttle valve. The grease can be pushed out from the outlet or injected into the cylinder room via the branch passage by opening the other throttle valve, and the grease filled in the cylinder room can be injected at high pressure from the injection outlet by a plunger in the cylinder room. To provide a grease gun in which a low-pressure extruder and a high-pressure injector are integrated.

[Function] The present invention uses a low-pressure extruder to fill the cylinder room for high-pressure injection with grease, and since a throttle valve is provided in the branch channel for this filling, the time required to fill the cylinder room is shortened. Therefore, it is possible to adjust the amount of grease to be injected.

Furthermore, grease can be continuously extruded at low pressure by opening the throttle valve near the extrusion outlet of the low-pressure extrusion flow path while closing the throttle valve installed in the branch flow path to the cylinder room for high-pressure injection. Yes, one grease gun can be used as both a low pressure extruder and a high pressure injector.

[Example] An example of the present invention is a grease gun that extrudes or injects grease using low-pressure compressed air of 10 kg/cm ² or less.
As shown in the figure, the main body has a cylindrical shape and has a cassette storage section 15 for storing a grease cassette 17 in the upper part, an air room 11 for extrusion behind the cassette storage section 15, and a grease hose 29 at the tip of the main body. Alternatively, it is a grease extrusion device that has a grease extrusion outlet 22 to which a grease nozzle can be attached, a grip part 41 below the main body, and a high-pressure injection part in front of the grip part 41.

The compressed air for extruding or injecting the grease is guided to the grease extrusion device by connecting an appropriate piping such as an air hose from an air compressor to the connector 19.

The main body of this grease extrusion device is
As shown in FIG. 3, the cassette storage section 15 and the extrusion air room 11 are separated by a partition wall 13 that can slide in an airtight manner, and the extrusion air room 11
The rear wall 12 is provided with a male connector 61 having a built-in check valve 62 that prevents compressed air from flowing out from the extrusion air room 11, and a safety valve 65. The air pressure in the room 11 is maintained at, for example, 5 kg/cm ² or less.

As shown in FIG. 5, this safety valve 65 is constructed by pressing a packing 66 with a spring 67, for example.
When an air pressure of Kg/cm ² or more is applied to the surface of the packing 66, the spring 67 is pushed by the air pressure to prevent air from leaking out and creating more pressure than necessary, as shown in Figure 6. ring 6
9, pull the shaft 68, and remove the ring 69.
This is a safety valve 65 that can be maintained in an open state by rotating 90 degrees. In addition, as shown in FIG. 7, the connector 61 with a built-in check valve 62 closes the check valve 62 by the air pressure inside the extrusion air room 11 when air is about to flow out from the extrusion air room 11. It is a switching valve 5 which will be described later.
The compressed air from the flow path 45 via 1 is passed to the extrusion air room 11 as shown in FIG.

Moreover, the grip part 4 of the grease extrusion device according to the present invention
1, from the air compressor to the connector 19
The flow path 42 passed through is branched, and one flow path 43 is a flow path 45 connected to a connector 61 containing a check valve 62 of the extrusion air room 11 via a switching valve 51. This switching valve 51 normally opens the air inlet of the connector 61 to the atmosphere, and connects the flow path 43 from the air compressor to the air inlet of the connector 61 when necessary. That is,
The switching valve 51 is, for example, as shown in FIG. 4, in which a closing part 53 having a packing 57 on the back side and an extrusion part 52 having a packing 58 on the back side are connected by a shaft 54, and normally the closing part 53 is The pressure inside the flow path 43 pushes up and closes the flow path 43, and when the pressing part 52 is pressed with a finger, the packing 58 on the back side of the pressing part 52 closes the air outlet 55, and the closing part 53 is pushed down to close the flow path 43. Compressed air passes through the gap 56 around the shaft 54, is sent to the flow path 45 to the connector 61, and is sent into the extrusion air room 11 from the inlet of the connector 61.

Furthermore, within the gripping portion 41, another flow path 44 branching off from the flow path 42 from the air compressor is connected to the piston room 31 for high pressure injection via an injection switching valve 59.
It connects to the rear chamber 34 at. Note that a spring 33 for pressing the piston 32 is inserted into the front chamber of the piston room 31.

The extrusion passage 21 through which grease is extruded from the grease cassette 17 is provided with a first closable throttle valve 25 near the extrusion outlet 22 to which a grease hose or the like can be attached and detached. The branch passage 23 leading to the cylinder room 35 for high-pressure injection provided in front of the piston room 31 is branched, and a second branch passage 23 that can be closed also to the branch passage 23 is provided.
A throttle valve 26 is provided.

Note that the extrusion channel 21 is provided with an air vent passage 27 and an air vent valve 28 for removing air bubbles in the extrusion channel 21 and the branch channel 23. As shown in FIG. 8B, this air vent valve 28 is preferably one that allows air to be easily vented by pushing down a pin and lowering a spherical valve body.

Further, the first throttle valve 25 and the second throttle valve 26
For example, the shaft is rotated by 90 degrees by rotating a lever by 90 degrees, and by shifting the axis of the through hole provided in the shaft from the axis of the extrusion channel 21 or the axis of the branch channel 23, respectively. It has a simple and robust structure that changes the flow rate, and by rotating the lever 90 degrees to the left and right from the open state, it can be closed on both the left and right sides, and in the closed state, the lever can pass through the shaft. By screwing it in, the throttle valve can be locked in the open state, thereby preventing the throttle valve from opening accidentally.

The high pressure injection cylinder room 35
The second injector injects grease at high pressure using a plunger 36 that is pressed by a piston 32 provided in the piston room 31.
By throttling the throttle valve 26, the time required to fill the cylinder room 35 with grease can be changed, and when performing high-pressure injection at regular intervals, the second throttle valve 26 can be throttled to inject at high pressure. It becomes possible to easily adjust the amount of grease. In addition, the cylinder room 35 serves as an injection outlet.
A check valve 38 is provided on the outlet side of the plunger 36.
This prevents grease from returning when reversing.

Since the grease gun according to the present invention has the above-described structure, when the press part 52 of the switching valve 51 is pressed while the grease cassette 17 is stored in the cassette storage part 15, compressed air from the air compressor is released into the cassette. It is sent to the extrusion air room 11 behind the storage section 15, and the pressure in the extrusion air room 11 increases.
When the pressure reaches 5 Kg/cm ² , the safety valve 65 opens and the pressure in the extrusion air room 11 is maintained at 5 Kg/cm ² .

Then, when the pressing part 52 of the switching valve 51 is released, the closing part 53 is pushed up by the air pressure in the flow path 43, and the compressed air in the flow path 45 between the switching valve 51 and the check valve 62 is released from the switching valve 51. It flows out from the outlet 55 and returns the pressure in the flow path 45 to one atmosphere. At this time, the check valve 62 built in the connection part 61 is activated by the internal pressure of the extrusion air room 11 to prevent the air from flowing out in the extrusion air room 11, and the pressure of 5 kg/cm ² is maintained. The pressure is applied to the bottom of the grease cassette 17 through the partition wall 13, forcing the grease in the grease cassette 17 into the extrusion channel 21.

If the first throttle valve 25 is opened in this state, the grease will continue to be squeezed out from the extrusion outlet 22, making it easier to apply the grease.

Further, when the first throttle valve 25 is closed and the second throttle valve 26 is opened, the grease pushed into the extrusion channel 21 is pushed out from the branch channel 23 to the cylinder room 35. At this time, a predetermined amount of grease is injected into the cylinder room 35 by adjusting the opening degree and opening time of the second throttle valve 26, and after the injection, compression is performed by pushing the pressing part that is the trigger of the injection switching valve 59. Air is transferred to the rear chamber 34 of the piston room 31.
to advance the piston 32 and move the plunger 3
6, the grease filled in the cylinder room 35 is injected from the injection outlet at high pressure. At this time, the air in the front chamber of the piston room 31 is discharged from the exhaust port 39.

The injection switching valve 59 has the same structure as the switching valve 51, and when you release your finger from the pressing part, the flow path 4 is closed.
4, the injection switching valve 59 connects the piston room rear chamber 34 to the atmosphere, and the spring 33 provided in the front chamber of the piston room 31 releases the air in the piston room rear chamber 34 while the piston 32 is moved. make it retreat. At this time, even when the plunger 36 retreats, the grease injected from the injection outlet is transferred to the cylinder room 3 by the check valve 38.
He is prevented from returning to 5.

The injection pressure during high-pressure injection of the grease is determined by the ratio of the diameter of the piston room 31 and the diameter of the cylinder room 35, and the pressure of the compressed air sent to the rear piston room 34 is 10
Even if it is Kg/ ^cm2 , the injection pressure of grease is 500Kg/cm2.
cm ² or more.

Furthermore, the amount of grease in the grease cassette 17 is reduced by extrusion of the grease from the extrusion outlet 22 or high-pressure injection from the injection outlet, and the partition wall 13 of the grease cassette storage section 15 moves forward, so that the extrusion air room 11 If the pressure decreases, press the pressing part 52 of the switching valve 51 again,
The extrusion air room 11 can be replenished with compressed air. Furthermore, when the grease in the grease cassette 17 is used up, open the safety valve 65 to return the pressure in the extrusion air room 11 to one atmosphere, remove the grease cassette storage section 15, and replace the grease cassette 17. This allows the grease gun to be easily refilled with grease.

[Effects of the Invention] The grease extrusion device according to the present invention can continuously extrude the grease in the grease cassette from the extrusion outlet at a low pressure, so that it can be extruded continuously onto sliding surfaces, surfaces such as wire ropes, and linear parts. This makes it extremely easy to apply grease, and it is also possible to perform high-pressure injection by pushing the grease into the cylinder room for high-pressure injection using a branch flow path from the extrusion flow path. Since low-pressure extrusion and high-pressure injection are possible, various grease-up operations such as grease application and high-pressure injection can be facilitated.Also, the throttle valve installed in the branch channel can reduce the amount of grease during high-pressure injection. can be easily adjusted, and unnecessary injection of grease can be prevented.

[Brief explanation of drawings]

Fig. 1 is a side view of the grease extrusion device according to the present invention, Fig. 2 is a front view, Fig. 3 is a sectional view, Fig. 4 is a diagram showing the structure of the switching valve, Figs. Figure 6 shows the safety valve, Figures 7 and 8 show the check valve, and Figure 9 shows the exhaust valve.
FIG. 10 is a diagram showing a conventional high-pressure injector. 10=grease extrusion device, 11=extrusion air room, 13=partition wall, 15=grease cassette storage section, 17=grease cassette, 21=extrusion channel, 23=division channel, 15=first throttle valve, 26=first 2 throttle valve, 31=piston room, 32=piston, 33=spring, 34=piston room rear chamber, 35=cylinder room, 36=plunger, 38=check valve, 41=gripping part, 42, 43,
44, 45 = air flow path, 51 = switching valve, 59 = injection switching valve, 61 = connector, 65 = safety valve.

Claims (1)

[Claims] 1 A low-pressure extruder capable of extruding grease from a grease cassette using compressed air stored in an air room for low-pressure extrusion, which has a cylinder room and a piston room for high-pressure injection, and has an extrusion outlet in the low-pressure extruder that can extrude grease from a grease cassette using compressed air stored in an air room for low-pressure extrusion. It has a branch passage from the grease extrusion passage communicating with the cassette to the cylinder room for high-pressure injection, and has a first closable throttle valve near the extrusion outlet, and a second throttle which is also closable to the branch passage. The valve includes a valve, and is configured to send compressed air to the air room for low-pressure extrusion, and also to a rear chamber of the piston room in the piston room for high-pressure injection, and further reciprocates within the piston room. A plunger integrated with a piston that can be used is provided in a cylinder room disposed in front of the piston room, and an injection outlet provided with a check valve is provided in front of the cylinder room, so that the first throttle valve By opening the grease cassette, the grease in the grease cassette is pushed out from the extrusion outlet, or by opening the second throttle valve, the grease is forced into the cylinder room through the branch passage, and the grease filled in this cylinder room is discharged into the cylinder room. An injectable grease extrusion device characterized in that the grease can be injected at high pressure from an injection outlet using a plunger.