Reciprocating motion control mechanism of hydraulic cylinder of spraying equipment and spraying equipment

Abstract

The invention discloses a reciprocating motion control mechanism of a hydraulic cylinder of spraying equipment and the spraying equipment. The reciprocating motion control mechanism comprises a hydraulic cylinder, an electromagnetic directional valve and a flow divider, wherein the flow divider is respectively close to the hydraulic cylinder and the electromagnetic directional valve; the flow divider is provided with a liquid channel, the liquid channel is directly communicated with the hydraulic cylinder and the electromagnetic reversing valve, and the electromagnetic reversing valve is used for controlling the flow direction of hydraulic liquid in the liquid channel so as to control the hydraulic cylinder to reciprocate. The structure is compact, the working environment of the hydraulic liquid sealing element can be improved, and the service life of the sealing element is prolonged.

Description

[0001] The present invention relates to spraying equipment. Background Art

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

[0003] The reciprocating motion of a plunger pump is typically controlled by a hydraulic cylinder and a solenoid reversing valve. The hydraulic cylinder's rod is connected to the plunger pump's plunger rod, driving its synchronous movement. The solenoid reversing valve is connected to the rodless and rod-mounted chambers of the hydraulic cylinder via piping, controlling the reciprocating motion of the hydraulic cylinder rod, and thus the plunger rod. The hydraulic cylinder is equipped with a travel sensor, which sends a detection signal to the controller when the hydraulic cylinder rod reaches its top or bottom dead center. Upon receiving this signal, the controller controls the solenoid reversing valve to perform the reversing action.

[0004] The solenoid reversing valve is connected to the hydraulic cylinder through a pipeline. On the one hand, due to the large number of pipelines and pipe joints, it is not conducive to the miniaturization and integration of the system. On the other hand, due to the long transmission path of the hydraulic liquid (usually oil), the temperature of the oil will be higher. Summary of the Invention

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

[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 in an embodiment of the present invention includes a hydraulic cylinder, an electromagnetic reversing valve and a diverter, and the diverter is close to the hydraulic cylinder and the electromagnetic reversing valve respectively; the diverter is provided with a liquid channel, which is directly connected to the hydraulic cylinder and the electromagnetic reversing valve respectively, and the electromagnetic reversing valve is used to control the flow direction of the hydraulic liquid in the liquid channel to control the reciprocating motion of the hydraulic cylinder.

[0008] The airless spraying equipment of an embodiment of the present invention includes a hydraulic pump and a plunger pump. The plunger pump includes a pump body and a plunger rod. One end of the plunger rod extends out of the pump body. The airless spraying equipment also includes the reciprocating motion control mechanism of the hydraulic cylinder of the above-mentioned spraying equipment. 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 diverter through a liquid supply pipe, and the liquid channel of the diverter is connected to the return pipe.

[0009] The present invention has at least the following advantages: 1. In the embodiment of the present invention, the flow divider is placed in close contact with the hydraulic cylinder and the electromagnetic reversing valve, and liquid channels are constructed on the flow divider to directly communicate with the hydraulic cylinder and the electromagnetic reversing valve, respectively. This eliminates the need for connecting pipes between the electromagnetic reversing valve and the hydraulic cylinder, making the product structure more compact and facilitating miniaturization of the spraying equipment. 2. The embodiment of the present invention shortens the oil transmission path and reduces the oil temperature by providing a diverter, thereby improving the working environment of the hydraulic liquid seal and extending the service life of parts such as the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 and Figure 2 The figures show the appearance diagram and cross-sectional diagram of the reciprocating motion control mechanism of the hydraulic cylinder of the spraying equipment according to one embodiment of the present invention.

[0011] Figure 3 A cross-sectional schematic diagram of the flow divider in an assembled state with a liquid supply pipe and a liquid return pipe is shown.

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

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

[0014] Figure 7 and Figure 8 A schematic diagram of the appearance and an exploded diagram of the reciprocating motion control mechanism of the hydraulic cylinder of the spraying equipment according to an embodiment of the present invention when assembled in the airless spraying equipment are respectively shown. DETAILED DESCRIPTION

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

[0016] Please refer to Figures 1 to 8 The reciprocating motion control mechanism of the hydraulic cylinder of the spraying equipment according to one embodiment of the present invention includes a hydraulic cylinder 1 , an electromagnetic reversing valve 2 , a diverter 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 to separate the cylinder body 11 into a rodless chamber 11a and a rod chamber 11b that are sealed from each other.

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

[0019] The diverter 3 is respectively close to the cylinder body 11 and the electromagnetic reversing valve 2. The cylinder body 11 and the diverter 3 are arranged side by side on the connecting frame 4 and are detachably connected to the connecting frame 4. The electromagnetic reversing valve 2 is detachably connected to the diverter 3.

[0020] The flow divider 3 is provided with a liquid channel, which is directly connected to the hydraulic cylinder 1 and the electromagnetic reversing valve 2 respectively. The electromagnetic reversing valve 2 is used to control the flow direction of the hydraulic liquid in the liquid channel to control the reciprocating motion of the hydraulic cylinder 1.

[0021] Furthermore, the liquid channel of the electromagnetic reversing valve 2 and the diverter 3 is configured as follows: when the electromagnetic reversing valve 2 is in the first working position, the liquid provided by the external hydraulic source flows back and forth between the liquid channel and the electromagnetic reversing valve 2 and then flows into the rodless chamber 11a of the hydraulic cylinder 1 through the liquid channel, and the liquid discharged from the rod chamber 11b of the hydraulic cylinder 1 flows back and forth between the liquid channel and the electromagnetic reversing valve 2 and then flows back to the rodless chamber 11a through the liquid channel, causing the hydraulic cylinder rod 13 to move toward the side of the rod chamber; when the electromagnetic reversing valve 2 is in the second working position, the liquid provided by the external hydraulic source flows into the rod chamber 11b of the hydraulic cylinder 1 through the liquid channel, and the liquid discharged from the rodless chamber 11a of the hydraulic cylinder flows back and forth between the liquid channel and the electromagnetic reversing valve 2 and then flows to the outside through the liquid channel, causing the hydraulic cylinder rod 13 to move toward the side of the rodless chamber 11a.

[0022] In this embodiment, the liquid channel includes a liquid inlet port 31, a liquid return port 32, a liquid inlet hole P', a working liquid hole A', a liquid return hole T1', a liquid return hole T2', an upper liquid channel 33, and a lower liquid channel 34. The liquid inlet port 31, the liquid return port 32, the liquid inlet hole P', the working liquid hole A', the liquid return hole T1', the liquid return hole T2', the upper liquid channel 33, and the lower liquid channel 34 all pass through the surface of the diverter 3. The liquid inlet port 31 and the liquid return port 32 are used to connect to the liquid supply pipe 51 and the liquid return pipe 52, respectively. Optionally, both the liquid inlet port 31 and the liquid return port 32 are threaded holes. The liquid inlet port 31 connects the liquid inlet port P' and the lower liquid channel 32, respectively. The liquid return port 32 connects the liquid return port T1' and the liquid return port T2', respectively. The working liquid port A' connects the upper liquid channel 33, which connects to the rodless chamber 11a, and the lower liquid channel 34 connects to the rod chamber 11b. The liquid inlet port P', working liquid port A', liquid return port T1', and liquid return port T2' correspond directly to the liquid inlet port P, working liquid port A, liquid return port T1, and liquid return port T2 of the electromagnetic reversing valve 2, respectively. When the electromagnetic reversing valve 2 is in the first working position, the working liquid port A connects to the liquid inlet port P. When the electromagnetic reversing valve 2 is in the second working position, the working liquid port A connects to the liquid return port T1 and the liquid return port T2.

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

[0024] Furthermore, the upper liquid channel 33 passes through the top surface and top side surface of the diverter 3, forming an upper opening 331 on the top side surface; the lower liquid channel 34 passes through the bottom surface and bottom side surface of the diverter 3, forming a lower opening 341 on the bottom side surface. 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 diverter 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 is directly connected to the upper opening 331. The lower cylinder head 112 covers both the cylinder body 110 and the bottom surface of the diverter 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 is directly connected to the lower opening 341. The hydraulic cylinder rod 13 passes through the lower cylinder head 112.

[0025] In this embodiment, a plurality of first connecting screws 141 pass through both the upper cylinder cover 111 and the lower cylinder cover 112 and are screwed together with the connecting frame 4, thereby connecting the hydraulic cylinder 1 and the diverter 3 to the connecting frame 4. A plurality of second connecting screws 142 pass through the electromagnetic reversing valve 2 and are screwed together with the diverter 3.

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

[0027] The oil pump 5 serving as a hydraulic source pumps high-pressure oil into the liquid inlet interface 31 of the diverter 3 through the liquid inlet pipe 51, and then flows into the liquid inlet P of the electromagnetic reversing valve 2 through the liquid inlet hole P'. Through the control channel inside the electromagnetic reversing valve 2, the oil at the liquid inlet P is introduced into the working liquid port A of the electromagnetic reversing valve 2, and then flows from the working liquid port A into the working liquid hole A' of the diverter 3, and then enters the upper liquid channel 33 of the diverter, and then 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 passes through the lower liquid channel 34, the liquid inlet interface 31, the liquid inlet hole P', the liquid inlet P, the working liquid port A, and the upper liquid channel 33, and returns to the rodless chamber 11a until the hydraulic cylinder rod 13 descends to the bottom dead point. At this time, the stroke sensor sends a detection signal to the controller. Upon receiving the detection signal, the controller sends a valve core switching instruction to the electromagnetic reversing valve 2. The electromagnetic reversing valve 2 receives the valve core switching instruction (i.e., the reversing instruction), and the electromagnetic reversing valve 2 switches from the state where the liquid inlet P is connected to the working liquid port A to the state where the working liquid port A is connected to the return liquid port T1 and the return liquid port T2 respectively (i.e., the electromagnetic reversing valve 2 switches from the first working position to the second working position). The high-pressure oil in the liquid inlet hole P' cannot enter the upper liquid channel 33 of the diverter through the liquid inlet port P of the electromagnetic reversing valve 2, and can only be transported 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, and the oil in the rodless chamber 11a flows to the working liquid hole A' through the upper liquid channel 33, and then flows to the return liquid port T1 and the return liquid port T2 through the working liquid port A. The return liquid port T1 and the return liquid port T2 are respectively connected to the return liquid hole T1' and the return liquid hole T2'. Therefore, the oil in the rodless chamber 11a flows into the return liquid interface 32 through the return liquid hole T1' and the return liquid hole T2', and then flows back to the oil tank 62 through the return liquid pipe 52 and the filter 61 in turn until the hydraulic cylinder rod 13 ascends to the top dead center. Through the above process, a cycle of up and down reciprocating motion of the hydraulic cylinder rod 13 is completed, and the process of absorbing and discharging liquid of the plunger rod connected to the hydraulic cylinder rod 13 is realized.

[0028] Figure 7 and Figure 8 The following diagrams respectively show the appearance and explosion diagram of the reciprocating motion control mechanism of the hydraulic cylinder of the spraying equipment when assembled in the airless spraying equipment according to one embodiment of the present invention. Among them, the motor 9 drives the oil pump 5 as a hydraulic pump to rotate through the V-belt transmission, and delivers the hydraulic oil in the oil tank to the diverter 3 and the electromagnetic reversing valve 2. The liquid channel in the diverter 3 and the electromagnetic reversing valve 2 are switched in different working positions to control the flow direction of the hydraulic oil and realize the up and down reciprocating motion of the hydraulic cylinder rod 13. Figure 2As shown, the plunger pump 8 comprises a pump body 81 and a plunger rod 83. One end of the plunger rod 83 extends outside the pump body 81 and is connected to the other end of the hydraulic cylinder rod 13, which extends outside the cylinder body 11, so that it moves synchronously with the hydraulic cylinder rod 13. A suction valve 85 and a discharge valve 86 are provided in the pump body 81. As the plunger rod 83 reciprocates up and down, the volume of the pump chamber 80 changes, causing the liquid to be sucked in. This in turn delivers the spray liquid to the spray gun via a high-pressure pipe, achieving the spraying function. A suction pipe 84 is also shown.

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

[0030] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A reciprocating motion control mechanism for a hydraulic cylinder of a spraying equipment, comprising a hydraulic cylinder and an electromagnetic reversing valve; characterized in that: The reciprocating motion control mechanism of the hydraulic cylinder of the spraying equipment further includes a diverter, which is respectively close to the hydraulic cylinder and the electromagnetic reversing valve; 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 liquid in the liquid channel to control the reciprocating motion of the hydraulic cylinder.

2. The reciprocating motion control mechanism of the hydraulic cylinder of the spraying equipment according to claim 1, characterized in that: The hydraulic cylinder comprises a cylinder body, a hydraulic piston and a hydraulic cylinder rod, wherein the hydraulic piston is connected to one end of the hydraulic cylinder rod to separate the cylinder body into a rodless chamber and a rod chamber which are sealed from each other; The liquid channel of the diverter is directly connected to the rodless cavity and the rod cavity respectively.

3. The reciprocating motion control mechanism of the hydraulic cylinder of the spraying equipment according to claim 2, characterized in that: The electromagnetic reversing valve and the liquid channel are configured as follows: when the electromagnetic reversing valve is in the first working position, the liquid provided by the external hydraulic source flows back and forth between the liquid channel and the electromagnetic reversing valve, and then flows into the rodless chamber of the hydraulic cylinder through the liquid channel; the liquid discharged from the rod chamber of the hydraulic cylinder flows back and forth between the liquid channel and the electromagnetic reversing valve, and then flows back to the rodless chamber through the liquid channel, causing the hydraulic cylinder rod to move toward the side of the rod chamber; when the electromagnetic reversing valve is in the second working position, the liquid provided by the external hydraulic source flows into the rod chamber of the hydraulic cylinder through the liquid channel, and the liquid discharged from the rodless chamber of the hydraulic cylinder flows back and forth between the liquid channel and the electromagnetic reversing valve, and then flows to the outside through the liquid channel, causing the hydraulic cylinder rod to move toward the side of the rodless chamber.

4. The reciprocating motion control mechanism of the hydraulic cylinder of the spraying equipment according to claim 2, characterized in that: The liquid channel includes a liquid inlet interface, a liquid return interface, a liquid inlet hole, a working liquid hole, a liquid return hole, an upper liquid channel and a lower liquid channel, and the liquid inlet interface, the liquid return interface, the liquid inlet hole, the working liquid hole, the liquid return hole, the upper liquid channel and the lower liquid channel all pass through the surface of the diverter; the liquid inlet interface and the liquid return interface are respectively used to connect the liquid supply pipe and the liquid return pipe, the liquid inlet interface is respectively connected to the liquid inlet hole and the lower liquid channel, the liquid return interface is connected to the liquid return hole, and the working liquid hole is connected to the upper liquid channel; the upper liquid channel is connected to the rodless cavity, and the lower liquid channel is connected to the rod cavity; The electromagnetic reversing valve has a liquid inlet, a working liquid inlet and a liquid return port, and the liquid inlet, the working liquid inlet and the liquid return port respectively correspond to the liquid inlet hole, the working liquid hole and the liquid return hole of the diverter; when the electromagnetic reversing valve is in the first working position, the working liquid inlet is connected to the liquid inlet, and when the electromagnetic reversing valve is in the second working position, the working liquid inlet is connected to the liquid return port.

5. The reciprocating motion control mechanism of the hydraulic cylinder of the spraying equipment according to claim 4, characterized in that: The upper liquid channel passes through the top surface and the top side surface of the diverter, and forms an upper opening on the top side surface; the lower liquid channel passes through the bottom surface and the bottom side surface of the diverter, and forms a lower opening on the bottom side surface; The cylinder body includes a cylinder body, an upper cylinder cover and a lower cylinder cover; the upper cylinder cover covers the top surface of the cylinder body and the diverter at the same time, the rodless chamber is defined by the upper cylinder cover, the side wall of the cylinder body and the hydraulic piston, and is directly connected to the upper opening; the lower cylinder cover covers the bottom surface of the cylinder body and the diverter at the same time, the rod chamber is defined by the lower cylinder cover, 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 cover.

6. The reciprocating motion control mechanism of the hydraulic cylinder of the spraying equipment according to claim 4, characterized in that: The electromagnetic reversing valve has two liquid return ports, and the diverter is provided with two liquid return holes. The two liquid return ports are respectively opposite to the two liquid return holes, and the two liquid return holes are both connected to the liquid return interface.

7. The reciprocating motion control mechanism of the hydraulic cylinder of the spraying equipment according to claim 1, characterized in that: The electromagnetic reversing valve is detachably connected to the diverter.

8. The reciprocating motion control mechanism of the hydraulic cylinder of the spraying equipment according to claim 1 or 7, characterized in that: The reciprocating motion control mechanism includes a connecting frame; The cylinder body and the diverter are arranged side by side on the connecting frame and are detachably connected to the connecting frame.

9. The reciprocating motion control mechanism of the hydraulic cylinder of the spraying equipment according to claim 1, characterized in that: The hydraulic cylinder is an oil cylinder.

10. An airless spraying device, comprising a hydraulic pump and a plunger pump, wherein the plunger pump comprises 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 comprises a reciprocating motion control mechanism for a hydraulic cylinder of the spraying equipment according to any one of claims 1 to 9, wherein a hydraulic cylinder rod of the hydraulic cylinder of the reciprocating motion control mechanism for 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 communicated with the liquid channel of the diverter through a liquid supply pipe, and the liquid channel of the diverter is connected to the liquid return pipe.

11. The airless spraying equipment according to claim 10, characterized in that The airless spraying equipment is a putty sprayer.

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