Reciprocating motion control mechanism for a spray device hydraulic cylinder and a spray device

Abstract

A reciprocating motion control mechanism of a hydraulic cylinder of a spraying device and the spraying device. The reciprocating motion control mechanism comprises a hydraulic cylinder, an electromagnetic reversing valve and a flow divider, the flow divider is in close contact with the hydraulic cylinder and the electromagnetic reversing valve respectively; the flow divider is provided with a liquid passage, the liquid passage is in direct communication with the hydraulic cylinder and the electromagnetic reversing valve respectively, and the electromagnetic reversing valve is used for controlling the flow direction of hydraulic liquid in the liquid passage to control the reciprocating motion of the hydraulic cylinder. The present application has compact structure, can improve the working environment of the hydraulic liquid seal, and prolong the service life of the seal.

Description

[0001] This invention relates to spraying equipment. Background Technology

[0002] Airless spraying equipment (such as putty spraying machines) uses a plunger pump to pressurize the paint and deliver the pressurized paint through a hose to the spray gun. The pressure is released through the nozzle to form an atomization, thereby forming a coating on the surface to be sprayed. Its working method is usually that in each reciprocating cycle of the plunger (i.e., the cycle), the first half of the cycle is filled with liquid but no spraying, and the second half of the cycle is sprayed but no liquid is filled, and so on.

[0003] The reciprocating control of a piston pump is typically achieved using a hydraulic cylinder and a solenoid directional valve. The hydraulic cylinder rod is connected to the piston rod of the piston pump, driving the piston rod to move synchronously. The solenoid directional valve is connected via pipelines to both the rodless and rod-side chambers of the hydraulic cylinder to control the reciprocating motion of the hydraulic cylinder rod, thereby achieving the reciprocating motion of the piston rod. The hydraulic cylinder is equipped with a stroke sensor, which sends a detection signal to the controller when the hydraulic cylinder rod reaches the top dead center or bottom dead center. Upon receiving the detection signal, the controller activates the solenoid directional valve to perform a reversing action.

[0004] The electromagnetic directional valve is connected to the hydraulic cylinder through pipelines. On the one hand, the large number of pipelines and pipe joints makes it difficult to miniaturize and integrate the system. On the other hand, the long transmission path of the hydraulic fluid (usually oil) leads to a higher oil temperature. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a reciprocating motion control mechanism for the hydraulic cylinder of a spraying equipment that has a simple and compact structure and can reduce the temperature of the hydraulic fluid.

[0006] Another technical problem to be solved by the present invention is to provide an airless spraying device.

[0007] The reciprocating motion control mechanism of the hydraulic cylinder of the spraying equipment according to an embodiment of the present invention includes a hydraulic cylinder, an electromagnetic reversing valve, and a flow divider. The flow divider is close to the hydraulic cylinder and the electromagnetic reversing valve respectively. The flow divider is provided with a liquid channel, which is directly connected to the hydraulic cylinder and the electromagnetic reversing valve respectively. The electromagnetic reversing valve is used to control the flow direction of the hydraulic fluid in the liquid channel so as to control the reciprocating motion of the hydraulic cylinder.

[0008] The airless spraying equipment of this invention includes a hydraulic pump and a plunger pump. The plunger pump includes a pump body and a plunger rod, with one end of the plunger rod extending out of the pump body. The airless spraying equipment also includes the reciprocating motion control mechanism of the hydraulic cylinder of the spraying equipment mentioned above. The hydraulic cylinder rod of the hydraulic cylinder of the reciprocating motion control mechanism of the hydraulic cylinder of the spraying equipment extends out of the cylinder body and is connected to one end of the plunger rod. The outlet of the hydraulic pump is connected to the liquid channel of the distributor through a liquid supply pipe, and the liquid channel of the distributor is connected to the return pipe.

[0009] The present invention has at least the following advantages: 1. In this embodiment of the invention, by making the distributor closely attached to the hydraulic cylinder and the solenoid directional valve respectively, and constructing liquid channels on the distributor that are directly connected to the hydraulic cylinder and the solenoid directional valve respectively, the connecting pipeline between the solenoid directional valve and the hydraulic cylinder is eliminated, making the product structure more compact and facilitating the miniaturization of the spraying equipment. 2. By setting up a flow divider, the oil transmission path is shortened and the oil temperature is reduced, thereby improving the working environment of the hydraulic fluid seals and extending the service life of the seals and other parts. Attached Figure Description

[0010] Figure 1 and Figure 2 The diagram shows an external view and a cross-sectional view of the reciprocating motion control mechanism of the hydraulic cylinder of a spraying equipment according to an embodiment of the present invention.

[0011] Figure 3 A cross-sectional schematic diagram of the distributor is shown when it is assembled with the supply and return pipes.

[0012] Figure 4 and Figure 5 A schematic diagram of the external appearance and a schematic diagram of the cross section of a shunt according to an embodiment of the present invention are shown respectively.

[0013] Figure 6 A schematic diagram of the external appearance of an electromagnetic directional valve according to an embodiment of the present invention is shown.

[0014] Figure 7 and Figure 8 The diagrams show an external view and an exploded view of the reciprocating motion control mechanism of the hydraulic cylinder of the spraying equipment according to an embodiment of the present invention when it is assembled in an airless spraying equipment. Detailed Implementation

[0015] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0016] Please refer to Figures 1 to 8 According to an embodiment of the present invention, the reciprocating motion control mechanism of the hydraulic cylinder of the spraying equipment includes a hydraulic cylinder 1, an electromagnetic reversing valve 2, a flow divider 3, and a connecting frame 4.

[0017] The hydraulic cylinder 1 includes a cylinder body 11, a hydraulic piston 12, and a hydraulic cylinder rod 13. The hydraulic piston 12 is connected to one end of the hydraulic cylinder rod 13, dividing the cylinder body 11 into a rodless chamber 11a and a rod chamber 11b that are sealed to each other.

[0018] In this embodiment, hydraulic cylinder 1 is an oil cylinder.

[0019] The flow divider 3 is close to the cylinder body 11 and the solenoid directional valve 2 respectively. The cylinder body 11 and the flow divider 3 are arranged side by side on the connecting frame 4 and are detachably connected to the connecting frame 4. The solenoid directional valve 2 is detachably connected to the flow divider 3.

[0020] The distributor 3 is provided with a liquid channel, which is directly connected to the hydraulic cylinder 1 and the solenoid directional valve 2 respectively. The solenoid directional valve 2 is used to control the flow direction of the hydraulic fluid in the liquid channel so as to control the hydraulic cylinder 1 to perform reciprocating motion.

[0021] Furthermore, the liquid passages of the electromagnetic directional valve 2 and the flow divider 3 are configured such that: when the electromagnetic directional valve 2 is in the first working position, the liquid supplied by the external hydraulic source flows back and forth between the liquid passage and the electromagnetic directional valve 2, and then flows into the rodless chamber 11a of the hydraulic cylinder 1 through the liquid passage; the liquid discharged from the rod chamber 11b of the hydraulic cylinder 1 flows back and forth between the liquid passage and the electromagnetic directional valve 2, and then flows back to the rodless chamber 11a through the liquid passage, causing the hydraulic cylinder rod 13 to move towards the rod chamber side; when the electromagnetic directional valve 2 is in the second working position, the liquid supplied by the external hydraulic source flows into the rod chamber 11b of the hydraulic cylinder 1 through the liquid passage; the liquid discharged from the rodless chamber 11a of the hydraulic cylinder flows back and forth between the liquid passage and the electromagnetic directional valve 2, and then flows outward through the liquid passage, causing the hydraulic cylinder rod 13 to move towards the rodless chamber 11a side.

[0022] In this embodiment, the liquid channel includes an inlet port 31, a return port 32, an inlet hole P', a working liquid hole A', a return hole T1', a return hole T2', an upper liquid channel 33, and a lower liquid channel 34. The inlet port 31, return port 32, inlet hole P', working liquid hole A', return hole T1', return hole T2', upper liquid channel 33, and lower liquid channel 34 all penetrate the surface of the distributor 3. The inlet port 31 and return port 32 are respectively used to connect the supply pipe 51 and the return pipe 52. Optionally, both the inlet port 31 and the return port 32 are threaded holes. The inlet port 31 is connected to the inlet port P' and the lower liquid channel 32, respectively. The return port 32 is connected to the return port T1' and the return port T2', respectively. The working liquid port A' is connected to the upper liquid channel 33, which is connected to the rodless chamber 11a. The lower liquid channel 34 is connected to the rod chamber 11b. The inlet port P', working liquid port A', return port T1', and return port T2' are respectively aligned with the inlet port P, working liquid port A, return port T1, and return port T2 of the solenoid directional valve 2. When the solenoid directional valve 2 is in the first working position, the working liquid port A is connected to the inlet port P. When the solenoid directional valve 2 is in the second working position, the working liquid port A is connected to the return ports T1 and T2.

[0023] In other embodiments, the electromagnetic reversing valve 2 has only one return port, and correspondingly, the diverter 3 also has only one return hole opposite to the return port.

[0024] Furthermore, the upper liquid channel 33 penetrates the top surface and top side of the distributor 3, forming an upper opening 331 on the top side; the lower liquid channel 34 penetrates the bottom surface and bottom side of the distributor 3, forming a lower opening 341 on the bottom side. The cylinder body 11 includes a cylinder body 110, an upper cylinder head 111, and a lower cylinder head 112. The upper cylinder head 111 covers both the cylinder body 110 and the top surface of the distributor 3. The rodless chamber 11a is defined by the upper cylinder head 111, the side wall of the cylinder body 110, and the hydraulic piston 12, and directly connects to the upper opening 331. The lower cylinder head 112 covers both the cylinder body 110 and the bottom surface of the distributor 3. The rod chamber 11b is defined by the lower cylinder head 112, the side wall of the cylinder body 110, and the hydraulic piston 12, and directly connects to the lower opening 341. The hydraulic cylinder rod 13 passes through the lower cylinder head 112.

[0025] In this embodiment, multiple first connecting screws 141 pass through both the upper cylinder head 111 and the lower cylinder head 112, and are screwed together with the connecting bracket 4 to connect the hydraulic cylinder 1 and the flow divider 3 to the connecting bracket 4. Multiple second connecting screws 142 pass through the solenoid directional valve 2 and are screwed together with the flow divider 3.

[0026] The working process of the reciprocating motion control mechanism of the hydraulic cylinder of the spraying equipment according to an embodiment of the present invention is described below.

[0027] The oil pump 5, acting as the hydraulic power source, pumps high-pressure oil into the inlet port 31 of the distributor 3 through the inlet pipe 51. Then, the oil flows into the inlet port P of the solenoid directional valve 2 through the inlet hole P'. Through the control channel inside the solenoid directional valve 2, the oil inlet port P is guided to the working port A of the solenoid directional valve 2. Then, it flows from the working port A into the working port A' of the distributor 3, and then into the upper liquid channel 33 of the distributor. Finally, it enters the rodless chamber 11a of the hydraulic cylinder 1, pushing the hydraulic piston 12 and the hydraulic cylinder rod 13 to move downward. At this time, the oil in the rod chamber 11b of the hydraulic cylinder 1 returns to the rodless chamber 11a through the lower liquid channel 34, the inlet port 31, the inlet hole P', the inlet port P, the working port A, and the upper liquid channel 33, until the hydraulic cylinder rod 13 descends to the lower dead center. At this time, the stroke sensor sends a detection signal to the controller. When the controller receives the detection signal, it sends a valve core switching command to the solenoid directional valve 2. When the solenoid directional valve 2 receives the valve core switching command (i.e., the switching command), the solenoid directional valve 2 switches from the state where the inlet port P and the working port A are connected to the state where the working port A is connected to the return port T1 and the return port T2 respectively (i.e., the solenoid directional valve 2 switches from the first working position to the second working position). The high-pressure oil in the inlet port P' cannot enter the upper liquid channel 33 of the distributor through the inlet port P of the solenoid directional valve 2. Instead, it can only be delivered to the rod chamber 11b of the hydraulic cylinder 1 through the lower liquid channel 34, thereby pushing the hydraulic piston 12 and the hydraulic cylinder rod 13 to move upward. The oil in the rodless chamber 11a flows to the working liquid port A' through the upper liquid channel 33, and then flows to the return port T1 and return port T2 through the working liquid port A. The return port T1 and return port T2 are connected to the return port T1' and return port T2', respectively. Therefore, the oil in the rodless chamber 11a flows into the return interface 32 through the return port T1' and return port T2', and then flows back to the oil tank 62 through the return pipe 52 and the filter 61 in sequence, until the hydraulic cylinder rod 13 moves to the top dead center. Through the above process, one cycle of the reciprocating motion of the hydraulic cylinder rod 13 is completed, realizing the process of liquid intake and discharge of the plunger rod connected to the hydraulic cylinder rod 13.

[0028] Figure 7 and Figure 8 The diagrams show an external view and an exploded view of the reciprocating motion control mechanism of the hydraulic cylinder of a spraying equipment according to an embodiment of the present invention, when assembled in an airless spraying equipment. The motor 9, via a V-belt drive, rotates the oil pump 5, which acts as a hydraulic pump, to deliver hydraulic oil from the tank to the distributor 3 and the solenoid directional valve 2. The flow direction of the hydraulic oil is controlled by switching between different working positions using the liquid channel in the distributor 3 and the solenoid directional valve 2, thereby realizing the up-and-down reciprocating motion of the hydraulic cylinder rod 13. Figure 2As shown, the plunger pump 8 includes a pump body 81 and a plunger rod 83. One end of the plunger rod 83 extends out of the pump body 81 and is connected to the other end of the hydraulic cylinder rod 13, which extends out of the cylinder body 11, so that it moves synchronously with the hydraulic cylinder rod 13. The pump body 81 is equipped with a suction valve 85 and a discharge valve 86. When the plunger rod 83 reciprocates up and down, the volume of the pump chamber 80 changes, creating a suction effect on the liquid, which is then transported to the spray gun through a high-pressure pipe to achieve the spraying function. A suction pipe 84 is also shown in the figure.

[0029] In this embodiment, the airless spraying equipment is a putty spraying machine.

[0030] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A reciprocating motion control mechanism for a hydraulic cylinder of a spraying equipment, comprising a hydraulic cylinder and a solenoid directional valve; characterized in that, The reciprocating motion control mechanism of the hydraulic cylinder of the spraying equipment also includes a flow divider, which is close to the hydraulic cylinder and the solenoid directional valve respectively; The distributor is provided with a liquid channel, which is directly connected to a hydraulic cylinder and a solenoid directional valve. The solenoid directional valve is used to control the flow direction of the hydraulic fluid in the liquid channel, so as to control the reciprocating motion of the hydraulic cylinder. The hydraulic cylinder includes a cylinder body, a hydraulic piston, and a hydraulic cylinder rod. The hydraulic piston is connected to one end of the hydraulic cylinder rod, dividing the cylinder body into a rodless chamber and a rod chamber that are sealed to each other. The liquid channels of the distributor are directly connected to the rodless chamber and the rod chamber, respectively. Each liquid channel includes an inlet port, a return port, an inlet hole, a working fluid hole, a return fluid hole, an upper liquid channel, and a lower liquid channel. The inlet port, return port, inlet hole, working fluid hole, return fluid hole, upper liquid channel, and lower liquid channel all penetrate the surface of the distributor. The inlet port and return port are used to connect to the supply pipe and the return pipe, respectively. The inlet port is connected to the inlet hole and the lower liquid channel, and the return port is connected to the return fluid hole. The working fluid hole is connected to the upper liquid channel. The upper liquid channel is connected to the rodless chamber, and the lower liquid channel is connected to the rod chamber. The upper liquid channel penetrates the top surface and the top side surface of the distributor, forming an upper opening on the top side surface. The lower liquid channel penetrates the bottom surface and the bottom side surface of the distributor, forming a lower opening on the bottom side surface. The electromagnetic reversing valve has an inlet, a working port, and a return port, which are respectively aligned with the inlet, working port, and return port of the distributor. When the electromagnetic reversing valve is in the first working position, the working port is connected to the inlet, and when the electromagnetic reversing valve is in the second working position, the working port is connected to the return port. The cylinder body includes a cylinder body, an upper cylinder head, and a lower cylinder head; the upper cylinder head covers both the cylinder body and the top surface of the distributor; the rodless chamber is defined by the upper cylinder head, the side wall of the cylinder body, and the hydraulic piston, and is directly connected to the upper opening; the lower cylinder head covers both the cylinder body and the bottom surface of the distributor; the rod chamber is defined by the lower cylinder head, the side wall of the cylinder body, and the hydraulic piston, and is directly connected to the lower opening; the hydraulic cylinder rod passes through the lower cylinder head.

2. The reciprocating motion control mechanism of the hydraulic cylinder of the spraying equipment as described in claim 1, characterized in that, The electromagnetic directional valve and the liquid passage are configured such that: when the electromagnetic directional valve is in the first working position, the liquid supplied by the external hydraulic source flows back and forth between the liquid passage and the electromagnetic directional valve, and then flows into the rodless chamber of the hydraulic cylinder through the liquid passage; the liquid discharged from the rod chamber of the hydraulic cylinder flows back and forth between the liquid passage and the electromagnetic directional valve, and then flows back to the rodless chamber through the liquid passage, causing the hydraulic cylinder rod to move towards the rod chamber side; when the electromagnetic directional valve is in the second working position, the liquid supplied by the external hydraulic source flows into the rod chamber of the hydraulic cylinder through the liquid passage; the liquid discharged from the rodless chamber of the hydraulic cylinder flows back and forth between the liquid passage and the electromagnetic directional valve, and then flows outward through the liquid passage, causing the hydraulic cylinder rod to move towards the rodless chamber side.

3. The reciprocating motion control mechanism of the hydraulic cylinder of the spraying equipment as described in claim 1, characterized in that, The electromagnetic reversing valve has two return ports, and the diverter has two return holes. The two return ports are respectively opposite to the two return holes, and the two return holes are connected to the return interface.

4. The reciprocating motion control mechanism of the hydraulic cylinder of the spraying equipment as described in claim 1, characterized in that, The electromagnetic reversing valve is detachably connected to the flow divider.

5. The reciprocating motion control mechanism of the hydraulic cylinder of the spraying equipment as described in claim 1 or 4, characterized in that, The reciprocating motion control mechanism includes a connecting frame; The cylinder block and the distributor are arranged side by side on the connecting frame and are detachably connected to the connecting frame.

6. The reciprocating motion control mechanism of the hydraulic cylinder of the spraying equipment as described in claim 1, characterized in that, The hydraulic cylinder mentioned is an oil cylinder.

7. An airless spraying device, comprising a hydraulic pump and a plunger pump, the plunger pump comprising a pump body and a plunger rod, one end of the plunger rod extending out of the pump body, characterized in that, The airless spraying equipment further includes a reciprocating motion control mechanism for the hydraulic cylinder of the spraying equipment as described in any one of claims 1 to 6, wherein the hydraulic cylinder rod of the hydraulic cylinder of the reciprocating motion control mechanism of the hydraulic cylinder of the spraying equipment extends out of the cylinder body and is connected to one end of the plunger rod. The outlet of the hydraulic pump is connected to the liquid channel of the distributor via a supply pipe, and the liquid channel of the distributor is connected to the return pipe.

8. The airless spraying equipment as described in claim 7, characterized in that, The airless spraying equipment mentioned is a putty spraying machine.

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