Hydraulic spraying mechanism

Abstract

The utility model discloses a hydraulic spraying mechanism which comprises a hydraulic cylinder and a coating cylinder, the hydraulic cylinder is provided with a first piston, the coating cylinder is provided with a second piston, the first piston is fixedly connected with the second piston, and the cross sectional area of the second piston is smaller than that of the first piston; the control valve is arranged on the hydraulic cylinder, and the control valve is connected with a pull rod of the first piston; the hydraulic cylinder comprises a first cavity and a second cavity, the first cavity and the second cavity are located on the two axial sides of the first piston, the first cavity is communicated with the first oil inlet, and the second cavity is communicated with the second oil inlet. According to the hydraulic spraying mechanism, automatic reciprocating reversing is achieved through movement of the first piston, so that the hydraulic spraying mechanism is simple in structure and stable and reliable in reversing.

Description

TECHNICAL FIELD

[0001] The utility model relates to surface processing technical field, especially, relate to a kind of hydraulic spraying mechanism. BACKGROUND

[0002] Hydraulic spraying machine is the important component of modern coating industry equipment, and has application in each industrial production of big to military aircraft small to manufacturing building.

[0003] Hydraulic spraying machine realizes the reciprocating motion of piston by reversing mechanism, and this is the basis for completing spraying work.The function of reversing mechanism is to control the start, stop, reversing and locking of execution element (such as hydraulic cylinder or hydraulic motor).The reversing mechanism of related technology is complex circuit, although it can meet the demand of frequent, continuous automatic reciprocating motion, but the structure is complex, stable and poor, and energy consumption is high. UTILITY MODEL CONTENT

[0004] To solve the problems in the related art, the present application provides a kind of hydraulic spraying mechanism, structure is simpler, and reversing is stable and reliable.

[0005] The first aspect of the present application provides a kind of hydraulic spraying mechanism, comprising:

[0006] Hydraulic cylinder and paint cylinder, the hydraulic cylinder is equipped with first piston, the paint cylinder is equipped with second piston, the first piston and the second piston are fixedly connected, wherein the cross-sectional area of the second piston is less than the cross-sectional area of the first piston;

[0007] Control valve, the control valve is arranged in the hydraulic cylinder, and the control valve is connected with the pull rod of the first piston;

[0008] Wherein, the hydraulic cylinder includes the first cavity and the second cavity on the axial two sides of the first piston, the first cavity is communicated with first oil inlet, and the second cavity is communicated with second oil inlet.

[0009] In an implementation manner, the control valve is a two-position three-way valve, the two-position three-way valve is provided with first end, second end and third end, the first end is used for being communicated with the first oil inlet, the second end is used for being communicated with oil return port, and the third end is used for being communicated with the first cavity.

[0010] In an implementation manner, the control valve includes a valve core that can be turned, the pull rod is matched with the valve core, when the pull rod moves along the axial direction, the valve core is driven to turn, so that the first end, the second end and the third end are in different conduction states.

[0011] In an implementation manner, oil pump, the first oil inlet and the second oil inlet are connected with the output port of oil pump;

[0012] An oil storage tank is connected to the second cavity.

[0013] In one implementation, the hydraulic cylinder is provided with a first clamping washer and a second clamping washer at two ends of the hydraulic cylinder respectively, when the first piston moves to the end close to the control valve, the first clamping washer is contacted, when the first piston moves to the end close to the paint cylinder, the second clamping washer is contacted.

[0014] In one implementation, the hydraulic cylinder is provided with a mounting cavity in the axial direction, the control valve is arranged in the mounting cavity, the pull rod penetrates the control valve in the axial direction and can move in the axial direction relative to the control valve;

[0015] The pull rod is provided with a first compression part and a second compression part on both sides of the control valve in the axial direction, the first compression part is provided with a first spring, and the second compression part is provided with a second spring; when the pull rod moves to the upper limit position, the control valve is switched to the on state by compressing the first spring; when the pull rod moves to the lower limit position, the control valve is switched to the on state by compressing the second spring.

[0016] In one implementation, the first compression part includes a first blocking piece fixed to the pull rod, and the first spring is sleeved on the pull rod, and two ends of the first spring are respectively in contact with the first blocking piece and one end of the valve core in the axial direction;

[0017] The second compression part includes a second blocking piece fixed to the pull rod, and the second spring is sleeved on the pull rod, and two ends of the second spring are respectively in contact with the second blocking piece and the other end of the valve core in the axial direction.

[0018] In one implementation, the valve core is movable in the axial direction at the mounting part, when the pull rod moves to the upper limit position, the valve core is driven to move upward to a first position by compressing the first spring, so that the second end and the third end of the control valve are in conduction; when the pull rod moves to the lower limit position, the valve core is driven to move downward to a second position by compressing the second spring, so that the first end and the third end of the control valve are in conduction.

[0019] In one implementation, the valve core of the control valve is arranged in the axial direction of the hydraulic cylinder, and is coaxially arranged with the first piston, the second piston and the pull rod.

[0020] In one implementation, the diameter of the hydraulic cylinder is 30mm-55mm;

[0021] The diameter of the first piston is 25mm-35mm;

[0022] The area ratio of the first cavity and the second cavity is 2:1.

[0023] The technical scheme provided in the application can have the following beneficial effects:

[0024] The scheme of the application can drive the pull rod to move in the axial direction when the first piston moves, and the control valve can be switched to different conduction states in the process of downward or upward movement of the pull rod, thereby reversing the spraying mechanism, and then the hydraulic cylinder linearly drives the paint cylinder to suck and discharge paint, so that the first piston moves to realize automatic reciprocating reversing, so that the hydraulic spraying mechanism of the application has simple structure and stable and reliable reversing.

[0025] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the application. BRIEF DESCRIPTION OF DRAWINGS

[0026] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which like reference characters refer to like parts throughout the several views, and in which the exemplary embodiments of the present application are shown.

[0027] Fig. 1 is a structural schematic diagram of the hydraulic spraying mechanism shown in the embodiments of the application;

[0028] Fig. 2 is a first state schematic diagram of the hydraulic spraying mechanism shown in the embodiments of the application;

[0029] Fig. 3 is a second state schematic diagram of the hydraulic spraying mechanism shown in the embodiments of the application.

[0030] Reference signs: 100, hydraulic cylinder; 111, first cavity; 112, second cavity; 101, first input port; 102, oil return port; 103, oil outlet; 104, control valve; 105, pull rod; 106, first piston; 107, second input port; 116, second piston; 114, valve core; 115, trigger rod; 1151, first blocking piece; 1152, second blocking piece. DETAILED DESCRIPTION

[0031] The preferred embodiments of the application will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the application are shown in the drawings, it should be understood that the application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the application more thorough and complete, and to fully convey the scope of the application to those skilled in the art.

[0032] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the term "and / or," as used herein, refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0033] The hydraulic spraying machine realizes the reciprocating motion of the piston through the reversing mechanism, which is the basis for completing the spraying work. The function of the reversing mechanism is to control the starting, stopping, reversing and locking of the actuator (such as a hydraulic cylinder or a hydraulic motor). The reversing mechanism of the related art is a complex circuit, which can meet the needs of frequent and continuous automatic reciprocating motion, but the structure is complex, the stability is poor, and the energy consumption is high. In view of the above problems, the hydraulic spraying mechanism provided in the embodiments of the present application has a simpler structure and stable and reliable reversing.

[0034] The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0035] Fig. 1 is a structural schematic diagram of the hydraulic spraying mechanism shown in the embodiments of the present application; Fig. 2 is a first state schematic diagram of the hydraulic spraying mechanism shown in the embodiments of the present application; Fig. 3 is a second state schematic diagram of the hydraulic spraying mechanism shown in the embodiments of the present application.

[0036] Referring to Figs. 1-3 , the present application provides a hydraulic cylinder 100 and a paint cylinder, the hydraulic cylinder 100 is provided with a first piston 106, the paint cylinder is provided with a second piston 116, the first piston 106 and the second piston 116 are fixedly connected, wherein the cross-sectional area of the second piston 116 is smaller than the cross-sectional area of the first piston 106, the paint cylinder is provided with a nozzle; a control valve 104 is arranged in the hydraulic cylinder 100, and the control valve 104 is connected with a pull rod 105 of the first piston 106; wherein the hydraulic cylinder 100 includes a first cavity 111 and a second cavity 112 on the two sides of the axial direction of the first piston 106, the first cavity 111 is communicated with a first oil inlet, and the second cavity 112 is communicated with a second oil inlet.

[0037] The scheme of the present application, when the first piston 106 moves, can drive the pull rod 105 to move in the axial direction, and in the process of the downward or upward movement of the pull rod 105, the control valve 104 can be switched to different conduction states, thereby reversing the spraying mechanism, and then linearly driving the paint cylinder to suck and discharge paint by the hydraulic cylinder 100, so as to realize automatic reciprocating reversing through the movement of the first piston 106, so that the hydraulic spraying mechanism of the present application has a simple structure and stable and reliable reversing.

[0038] The control valve 104 of the embodiment is a two-position three-way valve, two-position means having two trigger positions, and three-way means having three ports. The two-position three-way valve is provided with a first end, a second end and a third end, the first end is used for communication with the first oil inlet, the second end is used for communication with the oil return port 102, and the third end is used for communication with the first cavity 111. The control valve 104 includes a valve core 114 that can be turned, and the pull rod 105 cooperates with the valve core 114, when the pull rod 105 moves in the axial direction, it is used to drive the valve core 114 to turn, so that the first end, the second end and the third end are in different conduction states.

[0039] In the embodiment, the hydraulic cylinder 100 piston is connected with the paint cylinder piston, the extension and retraction of the hydraulic cylinder 100 piston changes the volume of the paint cylinder, and the paint is sucked and pressurized and discharged from the nozzle, so the pressure characteristics of the paint are closely related to the piston movement characteristics in the hydraulic cylinder 100. The application improves the reliability of the reciprocating motion of the piston in the hydraulic cylinder 100, and further enables the pressure characteristics of the paint to be more stable.

[0040] In some embodiments, the hydraulic spraying mechanism of the application further comprises an oil pump and an oil tank, the first oil inlet and the second oil inlet are connected with the output port of the oil pump, and the second cavity 112 is further connected with the oil tank. The oil pump can be a constant pressure variable pump.

[0041] The hydraulic spraying mechanism of the application is supplied with high-pressure oil at a constant pressure by a constant pressure variable pump. The two-position three-way control valve 104 is equivalent to a conversion amplifier, which converts and amplifies the axial displacement signal input to the valve core 114 into a hydraulic signal output to the hydraulic cylinder 100. The hydraulic cylinder 100 outputs displacement to drive the load to act, and the control valve 104 and the hydraulic cylinder 100 are mechanically connected together by the pull rod 105 to form a feedback loop.

[0042] The first and second clamping washers are respectively arranged at the two ends in the hydraulic cylinder 100. When the first piston 106 moves to the end close to the control valve 104, it contacts the first clamping washer, and when the first piston 106 moves to the end close to the paint cylinder, it contacts the second clamping washer. In this way, the first piston 106 can be buffered when running to the limit position in different directions.

[0043] In some embodiments, the hydraulic cylinder 100 is provided with a mounting cavity in the axial direction, the control valve 104 is arranged in the mounting cavity, the pull rod 105 penetrates the control valve 104 in the axial direction and can move relative to the control valve 104 in the axial direction, the pull rod 105 is provided with a first compression part and a second compression part on both sides of the control valve 104 in the axial direction, the first compression part is provided with a first spring, and the second compression part is provided with a second spring; when the pull rod 105 moves to the upper limit position, the control valve 104 is switched to the on state by compressing the first spring; when the pull rod 105 moves to the lower limit position, the control valve 104 is switched to the on state by compressing the second spring. By arranging the first spring and the second spring, the pull rod 105 can avoid direct contact with the valve core 114 in the axial direction, the impact force on the valve core 114 can be reduced, and the service life of the control valve 104 can be improved.

[0044] The first compression part includes a first blocking piece 1151 fixed to a trigger rod 115 of the pull rod 105, the first spring is sleeved on the trigger rod 115, and both ends of the first spring are in contact with the first blocking piece 1151 and one end of the valve core 114 in the axial direction, respectively; the second compression part includes a second blocking piece 1152 fixed to the trigger rod 115 of the pull rod 105, the second spring is sleeved on the trigger rod 115, and both ends of the second spring are in contact with the second blocking piece and the other end of the valve core 114 in the axial direction, respectively.

[0045] In the embodiment, the valve core 114 is movable in the axial direction at the mounting part, when the pull rod 105 moves to the upper limit position, the valve core 114 is driven to move upward to the first position by compressing the first spring, so that the second end and the third end of the control valve 104 are in conduction; when the pull rod 105 moves to the lower limit position, the valve core 114 is driven to move downward to the second position by compressing the second spring, so that the first end and the third end of the control valve 104 are in conduction. In the present application, the valve core 114 of the control valve 104 is arranged in the axial direction of the hydraulic cylinder 100, and is coaxially arranged with the first piston 106, the second piston 116 and the pull rod 105, so that the stress stability during the movement of the pull rod 105 can be improved, and the triggering of the valve core 114 can be more stable.

[0046] When the spool 114 is in the second position, the first end is in communication with the third end, the first end is closed with the second end, and the high-pressure oil output by the oil pump enters the first cavity 111 and the second cavity 112 on both sides of the first piston 106 through the first oil inlet and the second oil inlet respectively. Due to the cross-sectional area of the second piston 116 being smaller than that of the first piston 106, the first piston 106 extends under the area difference between the two cavities, and when the first piston 106 extends to the position of the second gasket at the bottom end of the pull rod 105, the first piston 106 pulls the pull rod 105 to move downward together, and then the pull rod 105 pulls the second spring on the upper side of the compression spool 114 to move the spool 114 downward to the first position, so that the second end of the control valve 104 is in communication with the third end, and the first end is closed with the third end. The high-pressure oil outlet by the oil pump only enters the second cavity 112 of the hydraulic cylinder 100, and the first cavity 111 is connected to the oil tank through the second port, so that the first piston 106 retracts and pushes the pull rod 105 to move upward together, and then the pull rod 105 pushes the first spring of the compression spool 114 to make the first end and the third end in communication, and the third end is closed with the second end, so as to realize the reversing.

[0047] In this application, the first cavity 111 and the second cavity 112 of the hydraulic cylinder 100 are connected together in a differential connection mode. This connection mode can make the oil in the first cavity 111 of the hydraulic cylinder 100 flow back to the second cavity 112 to increase the flow rate, and then increase the speed of the hydraulic cylinder 100 extending outward.

[0048] In some embodiments, the cylinder diameter of the hydraulic cylinder 100 is 30mm-55mm; the diameter of the first piston 106 is 25mm-35mm; in particular, the cylinder diameter of the hydraulic cylinder 100 and the diameter of the first piston 106 are 47.8mm and 33.8mm respectively, and the area ratio of the first cavity 111 and the second cavity 112 is 1:2, but not limited thereto.

[0049] The scheme of the present application adopts a valve-controlled differential hydraulic cylinder 100 design, a two-position three-way valve controls the reversing of the hydraulic cylinder 100, and the action of the hydraulic cylinder 100 drives the paint cylinder to move on one hand and drives the pull rod 105 to deliver the feedback signal to the control valve 104 on the other hand. The automatic reciprocating reversing is realized by the movement of the first piston 106, so that the hydraulic spraying mechanism of the present application has a simple structure and stable and reliable reversing.

[0050] Having described various embodiments of the application, it is to be understood that the above description is meant not to limit and not to encompass all of the possible embodiments. Many modifications and variations of this application can be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. It is intended that the scope of the application be defined by the scope of the patent and by the claims as allowed by the patent office, which can include adaptations based on the description, equivalents, and / or substitutions of elements individually or collectively to the entire disclosure.

Claims

1. A hydraulic spray mechanism, characterized by, The hydraulic cylinder is provided with a first piston, and the paint cylinder is provided with a second piston, and the first piston and the second piston are fixedly connected, wherein the cross-sectional area of the second piston is smaller than the cross-sectional area of the first piston. A control valve is arranged in the hydraulic cylinder, and the control valve is connected with the pull rod of the first piston. The hydraulic cylinder includes first and second cavities arranged on both sides of the first piston in the axial direction, the first cavity is communicated with the first oil inlet, and the second cavity is communicated with the second oil inlet.

2. The hydraulic spraying mechanism according to claim 1, wherein the control valve is a two-position three-way valve, the two-position three-way valve is provided with a first end, a second end and a third end, the first end is used for being communicated with the first oil inlet, the second end is used for being communicated with an oil return port, and the third end is used for being communicated with the first cavity.

3. The hydraulic spraying mechanism according to claim 2, wherein the control valve includes a valve core capable of being turned, the pull rod is matched with the valve core, and when the pull rod moves in the axial direction, the valve core is driven to be turned, so that the first end, the second end and the third end are in different conduction states. Further comprising: An oil pump, and the first oil inlet and the second oil inlet are connected with the output port of the oil pump. An oil storage tank, and the second cavity is further connected with the oil storage tank.

4. The hydraulic spray mechanism of claim 1, wherein, 5. The hydraulic spraying mechanism according to claim 1, wherein first and second clamping position washers are arranged at both ends in the hydraulic cylinder respectively, when the first piston moves to the end close to the control valve, the first clamping position washer is contacted, and when the first piston moves to the end close to the paint cylinder, the second clamping position washer is contacted.

6. The hydraulic spraying mechanism according to claim 3, wherein the hydraulic cylinder is provided with a mounting cavity in the axial direction, the control valve is arranged in the mounting cavity, the pull rod penetrates through the control valve in the axial direction and can move in the axial direction relative to the control valve. The pull rod is provided with first and second compression portions on both sides of the control valve in the axial direction, the first compression portion is provided with a first spring, and the second compression portion is provided with a second spring; when the pull rod moves to the upper limit position, the control valve is switched to the conduction state by compressing the first spring; and when the pull rod moves to the lower limit position, the control valve is switched to the conduction state by compressing the second spring.

7. The hydraulic spraying mechanism according to claim 6, wherein the first compression portion includes a first blocking piece fixed to the pull rod, the first spring is sleeved on the pull rod, and two ends of the first spring are respectively in contact with the first blocking piece and one end of the valve core in the axial direction; The second compression portion includes a second blocking piece fixed to the pull rod, the second spring is sleeved on the pull rod, and two ends of the second spring are respectively in contact with the second blocking piece and the other end of the valve core in the axial direction.

8. The hydraulic spraying mechanism according to claim 6, wherein ​ ​ ​ ​ ​ ​ The valve core is axially movable in the mounting portion, and when the pull rod runs to an upward limit position, the valve core is driven to move upward to a first position by compressing the first spring, so as to make the second end and the third end of the control valve conductive; when the pull rod runs to a downward limit position, the valve core is driven to move downward to a second position by compressing the second spring, so as to make the first end and the third end of the control valve conductive.

9. The hydraulic spraying mechanism according to claim 1, wherein: The valve core of the control valve is arranged axially on the hydraulic cylinder and coaxially with the first piston, the second piston and the pull rod.

10. The hydraulic spraying mechanism according to claim 1, wherein: The cylinder diameter of the hydraulic cylinder is 30-55 mm; The diameter of the first piston is 25-35 mm; The area ratio of the first cavity to the second cavity is 2:1.

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