Spraying machine

Abstract

The utility model provides a spraying machine, which comprises a spraying machine body, a spraying device, a spraying device and a control device, wherein the spraying machine body has a working state and an idle state; the return valve comprises a valve body and a sliding valve core, a feeding channel, a discharging channel and a return channel which are communicated with one another are arranged in the valve body, the return channel is provided with a valve port, the sliding valve core is movably arranged at the valve port, and the sliding valve core has an opening position for opening the valve port and a blocking position for blocking the valve port; the driving device drives the sliding valve element to move between the opening position and the blocking position; and the control device is in electric control connection with the driving device and the spraying machine body, and under the condition that the spraying machine body is switched to the idle state from the working state, the control device controls the driving device to work, so that the sliding valve element moves to the opening position from the plugging position. By means of the technical scheme, the problems that in the prior art, when a manual return valve is in a non-working state, manual operation is needed for pressure relief, leakage is prone to occurring, and putty is dried and hardened can be effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a spraying equipment field, specifically, relate to a spraying machine. BACKGROUND

[0002] In the putty spraying technical field, the airless putty spraying machine is widely used in indoor and outdoor decoration construction and is used for uniformly spraying putty powder on the working surface. The spraying machine mainly sucks putty liquid from the storage barrel into the pump cavity through the pumping device, then delivers it to the spray gun through the high-pressure pipeline, and finally sprays it at the nozzle in a high-pressure state to realize continuous and uniform spraying of putty.

[0003] At present, the conventional airless putty spraying machine is equipped with a high-pressure filter, and a manual backflow valve and a backflow pipe are connected behind the filter. The purpose is to vent or depressurize when the spraying machine is preparing for work or maintenance to prevent the putty from losing fluidity under high pressure and drying in the pump body, thereby avoiding the occurrence of pressure instability and blockage problems. However, the manual backflow valve mechanism has the following problems:

[0004] Firstly, the manual backflow valve needs to be manually operated by the user to depressurize after each stop of the spraying work. However, due to the complexity of the operation and the negligence of the user, the depressurization step is easy to be missed. Once the operation is missed, the putty is easy to dry under high pressure, causing the pump body, pipeline or nozzle of the spraying machine to be blocked, affecting the subsequent spraying effect and efficiency, and even requiring additional maintenance and cleaning work, increasing the cost and labor intensity.

[0005] In addition, the frequent operation of the manual backflow valve increases the burden of the user, especially in the case of continuous multi-batch work or high-frequency use, the frequent manual control is time-consuming and laborious. UTILITY MODEL CONTENTS

[0006] The main purpose of the utility model is to provide a spraying machine to solve the problem that the manual backflow valve needs to be manually operated to depressurize in the non-working state in the prior art, which is easy to be missed and causes the putty to dry.

[0007] In order to achieve the above object, the utility model provides a kind of spraying machine, comprising: spraying machine body, spraying machine body has working state and idle state, spraying machine body has pumping channel;Backflow valve, including valve body and sliding spool, valve body is provided with mutually communicating feed channel, discharge channel and backflow channel, feed channel is communicated with pumping channel, the middle part of backflow channel is provided with valve port, sliding spool is movably arranged at valve port, sliding spool has opening position of opening valve port and the plugging position of plugging valve port;Driving device, driving sliding spool moves between opening position and plugging position;Control device, with driving device and spraying machine body electric control connection, in the case where spraying machine body is switched from working state to idle state, control device controls driving device to work, to make sliding spool move from plugging position to opening position.

[0008] In one embodiment, the spraying machine further comprises: a switching mechanism, the driving device drives the switching mechanism to move, the switching mechanism comprises a cooperating structure cooperating with the sliding spool, and first and second limiting structures, when the switching mechanism moves to the first limiting structure and the sliding spool cooperates, the sliding spool is kept in the plugging position under the limitation of the first limiting structure, when the switching mechanism moves to the cooperating structure and the sliding spool cooperates, the sliding spool moves vertically under the abutting of the cooperating structure, and when the switching mechanism moves to the second limiting structure and the sliding spool cooperates, the sliding spool is kept in the opening position under the limitation of the second limiting structure.

[0009] In one embodiment, the switching mechanism comprises a rotating seat driven to rotate by the driving device, the rotating seat is provided with a cooperating groove, the cooperating groove comprises a first limiting groove segment, a second limiting groove segment, and a transition groove segment between the first limiting groove segment and the second limiting groove segment, the radius of the first limiting groove segment is smaller than the radius of the second limiting groove segment, the radius of the transition groove segment gradually increases from the first limiting groove segment to the second limiting groove segment, the sliding spool comprises a spool body and a cooperating shaft provided at the bottom of the spool body, the cooperating shaft is arranged in the cooperating groove, and the first limiting groove segment, the second limiting groove segment, and the transition groove segment form the second limiting structure, the first limiting structure, and the cooperating structure, respectively.

[0010] In one embodiment, the transition groove segment is an arc-shaped groove.

[0011] In one embodiment, the rotating seat comprises two relatively arranged rotating discs and a connecting piece connecting the two rotating discs, the cooperating grooves are arranged on the two rotating discs, and the cooperating grooves on the two rotating discs are opposite to each other, the two rotating discs form an avoiding gap avoiding the bottom of the spool body, and the cooperating shaft passes through the opposite two cooperating grooves on the two rotating discs.

[0012] In one embodiment, the matching shaft comprises a pin shaft crossing the bottom of the spool body, one end of the pin shaft is provided with a shaft head, the other end of the pin shaft is provided with an open pin, and the shaft head and the open pin are located outside the two rotating discs respectively.

[0013] In one embodiment, the rotating seat is made of polytetrafluoroethylene, nylon or polyformaldehyde.

[0014] In one embodiment, the switch mechanism comprises a moving wedge driven to move by the driving device, the upper surface of the wedge comprises a first limiting horizontal surface, a second limiting horizontal surface higher than the first limiting horizontal surface, and an inclined surface between the first limiting horizontal surface and the second limiting horizontal surface, and the sliding spool comprises a spool body and a ball provided on the bottom of the spool body, and the first limiting horizontal surface, the second limiting horizontal surface and the inclined surface form a first limiting structure, a second limiting structure and a matching structure respectively.

[0015] In one embodiment, the spraying machine further comprises a mounting seat provided on the valve body of the backflow valve, and the driving device is mounted on the mounting seat.

[0016] In one embodiment, the spraying machine further comprises a pressure measuring device provided on the valve body of the backflow valve, and the pressure measuring end of the pressure measuring device measures the pressure in the feeding channel and the discharging channel.

[0017] When the spraying machine body is in a working state, the sliding spool is in a plugging position closing the valve port, the communication between the feeding channel, the discharging channel and the backflow channel is prevented, and thus the putty can be continuously and stably conveyed to the spray gun through the pumping channel under high pressure to complete the spraying work. When the user does not need to spray, the spraying machine body is switched to an idle state, and the control device immediately responds to the state change, and the control device controls the driving device to start working. After receiving the control signal, the driving device immediately drives the sliding spool to move from the plugging position to the opening position, and at this time, the sliding spool gradually leaves the valve port, so that the backflow channel is in communication with the feeding channel and the discharging channel. At this time, the residual high-pressure putty liquid in the putty spraying machine can be quickly depressurized through the backflow channel, thereby avoiding the putty from drying under high pressure, preventing the pump body, pipeline or nozzle from being blocked, ensuring that the spraying machine can operate normally in the next work, improving the work efficiency and construction effect. From the above description, we can know that the above automatic pressure relief process does not require user intervention, thus the complexity of operation can be greatly reduced, the situation that the pressure relief step is missed due to user negligence is avoided, the maintenance and cleaning work is reduced, and the cost is reduced. At the same time, the frequent operation of the manual backflow valve is avoided, and the labor intensity of the maintenance personnel is reduced.

[0018] In addition to the objects, features and advantages described above, the present application has other objects, features and advantages. These and other objects, features and advantages of the present application will become apparent with reference to the following detailed description of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the present application, and are incorporated by reference herein. The present application is illustrated by and

[0020] In the drawings:

[0021] Figure 1 Fig. 1 shows a perspective view of an embodiment of a spraying machine according to the present application;

[0022] Figure 2 Fig. 2 shows a front view of the spraying machine of Fig. 1; Figure 1

[0023] Figure 3 Fig. 4 shows a top view of the spraying machine of Fig. 1; Figure 2

[0024] Figure 4 Fig. 5 shows a cross-sectional view of the spraying machine of Fig. 1 along the A-A direction; Figure 3

[0025] Figure 5 Fig. 6 shows an enlarged view of the B part of the spraying machine of Fig. 1; Figure 4

[0026] Figure 6 Fig. 7 shows a front view of the switch structure of the spraying machine of Fig. 1; and Figure 1

[0027] Fig. 8 shows a front view of another embodiment of a spraying machine according to the present application. Figure 7 In the drawings:

[0028] 10, return valve; 11, valve body; 111, feeding passage; 112, discharging passage; 113, return passage; 114, valve port; 12, sliding valve core; 121, valve core body; 122, matching shaft; 123, shaft head; 124, split pin; 125, ball; 20, driving device; 30, switch mechanism; 31, rotating disc; 311, matching groove; 312, first limiting groove section; 313, second limiting groove section; 314, transition groove section; 32, connecting piece; 33, first limiting horizontal plane; 34, second limiting horizontal plane; 35, inclined plane; 40, mounting base; 50, pressure measuring device.

[0029] DETAILED DESCRIPTION

[0030] ​​​​​It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0031] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

[0032] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0033] It should be noted that the terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0034] As Figures 1 to 6As shown, the spraying machine of the embodiment one comprises: a spraying machine body, a backflow valve 10, a driving device 20 and a control device. The spraying machine body has a working state and an idle state, and the spraying machine body has a pumping channel; the backflow valve 10 comprises a valve body 11 and a sliding spool 12, the valve body 11 is provided with a feeding channel 111, a discharging channel 112 and a backflow channel 113 which are in communication with each other, the feeding channel 111 is in communication with the pumping channel, a valve port 114 is arranged at the middle part of the backflow channel 113, the sliding spool 12 is movably arranged at the valve port 114, the sliding spool 12 has an opening position for opening the valve port 114 and a blocking position for blocking the valve port 114; the driving device 20 drives the sliding spool 12 to move between the opening position and the blocking position; the control device is electrically connected with the driving device 20 and the spraying machine body, in the case that the spraying machine body is switched from the working state to the idle state, the control device controls the driving device 20 to work so as to make the sliding spool 12 move from the blocking position to the opening position.

[0035] By applying the technical solution of the embodiment one, when the spraying machine body is in the working state, the sliding spool 12 is in the blocking position for closing the valve port 114, which prevents the feeding channel 111, the discharging channel 112 and the backflow channel 113 from being in communication with each other, thereby ensuring that the putty can be continuously and stably conveyed to the spray gun through the pumping channel under the high-pressure state to complete the spraying work. When the user does not need to spray, the spraying machine body is switched to the idle state, the control device immediately responds to this state change, and the control device controls the driving device 20 to start working. After receiving the control signal, the driving device 20 immediately drives the sliding spool 12 to move from the blocking position to the opening position, at this time, the sliding spool 12 gradually leaves the valve port 114, so that the backflow channel 113 is in communication with the feeding channel 111 and the discharging channel 112. At this time, the high-pressure putty liquid remaining in the interior of the putty spraying machine can be rapidly depressurized through the backflow channel 113, thereby avoiding the putty from being dried under the high-pressure state, and further preventing the pump body, the pipeline or the nozzle from being blocked, ensuring that the spraying machine can normally operate at the next time of work, improving the work efficiency and the construction effect. From the above description, we can know that the above automatic depressurization process does not need the intervention of the user, so the complexity of the operation can be greatly reduced, the situation that the depressurization step is missed due to the negligence of the user is avoided, the maintenance and cleaning work is reduced, and the cost is reduced. At the same time, the frequent operation of the manual backflow valve is avoided, and the labor intensity of the maintenance personnel is reduced.

[0036] As Figure 4As shown, in this embodiment, the feed channel 111 is a vertical channel, the discharge channel 112 is a horizontal channel communicating with the feed channel 111, and the return channel 113 includes intersecting vertical and horizontal connecting sections. The vertical connecting section is located below the feed channel 111, and the horizontal connecting section is located below the discharge channel 112. A valve port 114 is formed at the intersection of the vertical and horizontal connecting sections. The valve port 114 has a limiting section for limiting the sliding valve core 12, which can slide up and down within the limiting section.

[0037] like Figure 1 , Figure 2 , Figures 4 to 6 As shown, in Embodiment 1, the spraying machine further includes a switching mechanism 30. A driving device 20 drives the switching mechanism 30 to move. The switching mechanism 30 includes a mating structure that cooperates with the sliding valve core 12, as well as a first limiting structure and a second limiting structure. When the switching mechanism 30 moves to the point where the first limiting structure mates with the sliding valve core 12, the sliding valve core 12 remains in a blocked position under the limitation of the first limiting structure. When the switching mechanism 30 moves to the point where the mating structure mates with the sliding valve core 12, the sliding valve core 12 moves vertically under the resistance of the mating structure. When the switching mechanism 30 moves to the point where the second limiting structure mates with the sliding valve core 12, the sliding valve core 12 remains in an open position under the limitation of the second limiting structure. Specifically, when the switching mechanism 30 moves to the point where the first limiting structure contacts and mates with the sliding valve core 12, the function of the first limiting structure is to restrict the position of the sliding valve core 12, keeping it in a blocked position. At this time, the connection between the return channel 113 and the feed channel 111 and discharge channel 112 is cut off, ensuring the high-pressure pumping capability of the spraying machine in operation. When the spraying machine needs to switch to an idle state, the drive unit 20 controls the switching mechanism 30 to move to the position where the mating structure engages with the sliding valve core 12. As the drive unit 20 operates, the mating structure abuts against the sliding valve core 12, causing it to move vertically and move away from the blocked position. With the movement of the sliding valve core 12, the return channel 113 is opened, and the high pressure inside the putty spraying machine is quickly released, preventing the putty from drying under high pressure.

[0038] Finally, when the switching mechanism 30 moves to the point where the second limiting structure engages with the sliding valve core 12, the function of the second limiting structure is to restrict the position of the sliding valve core 12 and keep it in the open position. Even in the non-working state, this ensures the smooth flow of the return channel 113 and further prevents the putty from drying and clogging inside the sprayer.

[0039] Compared to the solution of directly driving the sliding valve core 12 to switch between the blocking and opening positions via a driving device, the technical solution of Embodiment 1 has at least the following three advantages:

[0040] Firstly, the introduction of the switching mechanism 30 allows for more precise control and positioning of the movement of the sliding spool 12. Through the cooperation of the first and second limit structures, it can be ensured that the sliding spool 12 is accurately stopped at the closed or open position, avoiding the problem of excessive movement or inaccurate positioning that may be caused by direct driving, making the switching operation of the backflow valve more reliable and accurate.

[0041] Secondly, in the direct driving scheme without the switching mechanism, the driving device 20 needs to continuously apply force to maintain the position of the spool. In the present scheme, the driving device 20 only needs to control the movement of the switching mechanism 30, and once the switching mechanism 30 reaches the position of the first or second limit structure, the driving device can be unloaded and no longer needs to continuously apply force. This reduces the workload of the driving device, reduces energy consumption, and prolongs the service life of the driving device.

[0042] Finally, since the spraying machine switches from the working state to the idle state, the control device can quickly respond and control the driving device 20 to start, and then quickly move the sliding spool 12 to the open position through the switching mechanism 30 to achieve rapid pressure relief. Compared with the direct driving scheme, the control process of embodiment one is smoother, the response speed is faster, and the efficiency is higher.

[0043] As Figure 1 , Figure 2 , Figures 4 to 6As shown, in the first embodiment, the switch mechanism 30 comprises a rotating seat driven to rotate by the driving device 20, and a matching groove 311 is arranged on the rotating seat, the matching groove 311 comprises a first limiting groove section 312, a second limiting groove section 313, and a transition groove section 314 between the first limiting groove section 312 and the second limiting groove section 313, the radius of the first limiting groove section 312 is smaller than the radius of the second limiting groove section 313, and the radius of the transition groove section 314 gradually increases in the direction from the first limiting groove section 312 to the second limiting groove section 313, the sliding valve core 12 comprises a valve core body 121 and a matching shaft 122 arranged at the bottom of the valve core body 121, the matching shaft 122 is arranged in the matching groove 311, and the first limiting groove section 312, the second limiting groove section 313, and the transition groove section 314 form the second limiting structure, the first limiting structure, and the matching structure respectively. Specifically, in the initial state, the matching shaft 122 of the sliding valve core 12 is located in the second limiting groove section 313 of the matching groove 311, at this time, the valve core body 121 of the sliding valve core 12 completely blocks the backflow valve port 114, the backflow channel 113 is closed, and the spray gun is kept in a high-pressure state, so as to facilitate continuous and stable spraying operation. When the driving device 20 is started and drives the rotating seat to rotate, the matching groove 311 on the rotating seat rotates together. The matching shaft 122 freely slides in the groove section, but due to the specific matching relationship between the matching shaft 122 and the groove section, when the matching groove 311 rotates to the transition groove section 314, because the radius of the transition groove section 314 gradually decreases, the upper groove wall of the transition groove section 314 pushes the matching shaft 122 to move downward, and further drives the sliding valve core 12 to move downward along the axis direction, so as to open the valve port 114, at this time, the backflow channel 113 is opened, the spray gun in a high-pressure state is rapidly depressurized, and the problem that putty powder is dry and clogged due to high pressure when the spray gun is idle is prevented. With the continuous rotation of the matching groove 311, the matching shaft 122 finally enters the first limiting groove section 312. The upper groove wall of the first limiting groove section 312 can abut against the matching shaft 122, so that the sliding valve core 12 is always kept in the open position. At this time, the driving device can be unloaded, and it is no longer necessary to continuously apply force. When the driving device 20 needs to restore the sliding valve core 12 to the blocking position, the rotating seat is reversely rotated, the matching shaft 122 passes through the transition groove section 314 in the opposite direction and then returns to the second limiting groove section 313, in this process, the matching shaft 122 moves upward, until the sliding valve core 12 re-blocks the backflow valve port 114, and the high-pressure state of the spray gun is maintained again, ready for the next spraying operation.

[0044] In embodiment one, the matching structure and limiting structure of the switch mechanism 30 are designed as a slot structure, which has significant advantages compared to other types of structures (such as cam, gear, connecting rod, etc.). First, the design of the slot structure can achieve precise path control and positioning, ensuring that the spool 12 follows the preset trajectory during movement, thereby more stably and accurately controlling the closing and opening positions of the spool, improving the reliability and consistency of the backflow valve switch. Second, using a slot structure can simplify the control strategy and driving action of the driving device 20. The driving device only needs to control the linear or rotary motion of the switch mechanism 30, and the pin shaft in the slot will automatically guide the spool 12 to complete the required motion, reducing the need for complex motion conversion and reducing the complexity and cost of system design. In addition, the limiting and matching functions of the slot structure allow the driving device to be unloaded after reaching the preset position, avoiding energy waste and additional wear of the driving elements caused by continuous force application, prolonging the service life of the driving device and improving energy efficiency. Finally, due to the relatively simple shape of the slot structure, it is easy to process and assemble, and it is easy to check and adjust during maintenance, ensuring long-term stable operation of the system and convenient maintenance.

[0045] As shown in Figure 6 embodiment one, the transition slot segment 314 is an arc-shaped slot. The above structure makes the movement of the spool more stable, reducing impact and wear during driving.

[0046] As shown in Figure 1 , Figure 2 , Figures 4 to 6As shown, in Embodiment 1, the rotating base includes two opposing turntables 31 and a connecting member 32 connecting the two turntables 31. Each turntable 31 has a mating groove 311, and the mating grooves 311 on the two turntables 31 are opposite each other, forming a clearance gap between the two turntables 31 to avoid the bottom of the valve core body 121. The mating shaft 122 passes through the two opposing mating grooves 311 on the two turntables 31. In the above structure, the design of the two turntables 31 provides a larger support area and a more stable rotating base, enhancing the rigidity and stability of the drive device 20 when driving the rotating base to rotate. Even in high-frequency switching operations, it ensures the smooth movement of the sliding valve core 12, avoiding valve core position deviation caused by possible eccentricity or vibration problems of a single turntable. Furthermore, the dual-turntable structure allows the workload of the drive device 20 to be more evenly distributed across the two turntables 31, reducing the torque and stress borne by a single turntable 31, thereby improving the load-bearing capacity and durability of the entire rotating base and extending its service life. In addition to the two advantages mentioned above, the mating grooves 311 on the two opposing turntables 31 can cooperate to form a more precise limiting and guiding system, ensuring the straightness and repeatability of the mating shaft 122 during movement. This improves the positioning accuracy of the sliding valve core 12 in the blocking and opening positions, which is crucial for controlling the opening and closing of the return valve. Finally, the above structure also brings an additional effect: due to the gap between the two turntables 31, this clearance allows the bottom of the valve core body 121 to move freely between the two turntables 31, thereby saving axial space and making the entire switching mechanism 30 more compact. This facilitates the implementation of more complex mechanical layouts within a limited space, while also simplifying installation and maintenance within the equipment.

[0047] like Figure 1 and Figure 5 As shown, in Embodiment 1, the mating shaft 122 includes a pin that passes through the bottom of the valve core body 121. One end of the pin is provided with a shaft head 123, and the other end of the pin is inserted with a cotter pin 124. The shaft head 123 and the cotter pin 124 are respectively located on the outer sides of the two turntables 31. In the above structure, the setting of the pin ensures a reliable connection between the sliding valve core and the rotating seat, and the use of the cotter pin prevents the pin from falling off. The above structure makes the control of the return valve safer and more reliable, reducing the control failure problem caused by the pin falling off. In other embodiments, other types of shafts and limiting structures, such as threaded shafts or snap rings, can be used to achieve different connection methods and limiting effects to adapt to the performance requirements of different spraying machines and solve the safety problem of return valve control under specific working conditions.

[0048] In the first embodiment, the rotating seat is made of polytetrafluoroethylene, or nylon or polyformaldehyde. Specifically, in the embodiment, the rotating seat is actually made of a material with self-lubricating property. The structure makes the rotating seat have good self-lubricating property and wear resistance, thereby making the control of the backflow valve more energy-saving, reducing the energy loss caused by friction, and reducing the maintenance cost. In other embodiments, different wear resistance and lubricating effects can be achieved by using other materials with self-lubricating property, such as graphite or metal matrix composite, to adapt to the working environment of different spray machines and solve the energy consumption problem of the backflow valve control under specific working conditions.

[0049] As shown in Figure 1 , Figure 2 and Figure 4 , in the first embodiment, the spray machine further comprises a mounting seat 40 arranged on the valve body 11 of the backflow valve 10, and the driving device 20 is mounted on the mounting seat 40. Specifically, the driving device 20 is mounted on the valve body 11 through the mounting seat 40, which can provide a stable mounting basis for the driving device.

[0050] As shown in Figure 1 , Figure 2 and Figure 4 , in the first embodiment, the spray machine further comprises a pressure measuring device 50 arranged on the valve body 11 of the backflow valve 10, and the pressure measuring end of the pressure measuring device 50 measures the pressure in the inlet channel 111 and the outlet channel 112. Specifically, the pressure measuring end of the pressure measuring device 50 extends into the inlet channel and the outlet channel, which can monitor the pressure change in the pipeline in real time, thereby making the operation of the spray machine more intelligent.

[0051] As shown in Figure 7As shown, the difference between the spraying machine of embodiment two and the spraying machine of embodiment one is only in the structure of the switch mechanism 30. Specifically, in embodiment two, the switch mechanism 30 comprises a moving wedge driven to move by the driving device 20 (a pneumatic cylinder), the upper surface of the wedge comprises a first limiting horizontal surface 33, a second limiting horizontal surface 34 higher than the first limiting horizontal surface 33, and a slope surface 35 between the first limiting horizontal surface 33 and the second limiting horizontal surface 34, the sliding spool 12 comprises a spool body 121 and a ball 125 arranged at the bottom of the spool body 121, and the first limiting horizontal surface 33, the second limiting horizontal surface 34 and the slope surface 35 form a first limiting structure, a second limiting structure and a matching structure respectively. Specifically, when the spraying machine is in a working state and high-pressure putty spraying is needed, the sliding spool 12 is opposite to the first limiting horizontal surface 33, when the spraying operation is paused and pressure relief is needed to prevent the putty from drying and clogging, the driving device 20 is started and pushes the moving wedge to move in a preset direction, at this time the slope surface 35 of the moving wedge extrudes the ball 125 at the bottom of the sliding spool 12. The design of the slope surface 35 makes the ball 125 move along the slope surface to the second limiting horizontal surface 34 during the movement of the wedge, in this process the ball 125 drives the spool body 121 to move upward until the ball 125 abuts against the second limiting horizontal surface 34, at this time the sliding spool 12 completely opens the backflow valve port 114, and the high pressure in the hose is quickly released, avoiding the putty from drying and clogging due to being in a high-pressure state for a long time, and ensuring the normal start and operation of the spraying machine in the next use. Conversely, when work is needed again, the driving device 20 drives the moving wedge to move reversely, and the sliding spool 12 can return to the blocking position by gravity or the elastic force of the spring. The above structure realizes the automatic control of the backflow valve 10, not only simplifies the operation process, improves the work efficiency, but also effectively prevents the spraying machine from malfunctioning due to the drying and clogging of the putty, and improves the reliability and service life of the equipment.

[0052] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the embodiments are not intended to limit the scope of the present application unless otherwise specifically stated. Meanwhile, it should be understood that the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportional relationship for the convenience of description. The techniques, methods and devices known to those skilled in the related art can not be discussed in detail, but should be considered as part of the authorized description under appropriate circumstances. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0053] For purposes of the description hereinafter, spatial terms, such as "above", "below", "upper", "lower", and the like, can be used with reference to the illustrated orientation of one device or feature to another device or feature, as illustrated in the figures. It will be further understood that the spatial terms are intended to encompass different orientations of the device or feature in addition to the orientation depicted in the figures. For example, if the device or feature is inverted or rotated 90 degrees, a spatial term that would have previously described a device or feature above or below another device or feature would now be interpreted as being below or above, respectively. Accordingly, the exemplary spatial terminology used herein is for purposes of describing the examples discussed herein and is not intended to be limiting.

[0054] In the description of the present application, it is to be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship is usually based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, therefore cannot be understood as limiting the protection scope of the present application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0055] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A spraying machine, characterized in that, include: The spraying machine body has a working state and an idle state, and the spraying machine body has a pumping channel; A reflux valve (10) includes a valve body (11) and a sliding valve core (12). The valve body (11) is provided with an interconnected feed channel (111), a discharge channel (112), and a reflux channel (113). The feed channel (111) is connected to the pumping channel. A valve port (114) is provided in the middle of the reflux channel (113). The sliding valve core (12) is movably disposed at the valve port (114). The sliding valve core (12) has an open position for opening the valve port (114) and a blocking position for blocking the valve port (114). The drive device (20) drives the sliding valve core (12) to move between the open position and the blocked position; The control device is electrically connected to the drive device (20) and the spraying machine body. When the spraying machine body switches from the working state to the idle state, the control device controls the drive device (20) to work so that the sliding valve core (12) moves from the blocking position to the opening position.

2. The spraying machine according to claim 1, characterized in that, The spraying machine also includes: A switching mechanism (30) is provided, and the driving device (20) drives the switching mechanism (30) to move. The switching mechanism (30) includes a mating structure that cooperates with the sliding valve core (12), as well as a first limiting structure and a second limiting structure. When the switching mechanism (30) moves to the point where the first limiting structure and the sliding valve core (12) are mated, the sliding valve core (12) is held in a blocked position under the limiting of the first limiting structure. When the switching mechanism (30) moves to the point where the mating structure and the sliding valve core (12) are mated, the sliding valve core (12) moves vertically under the abutment of the mating structure. When the switching mechanism (30) moves to the point where the second limiting structure and the sliding valve core (12) are mated, the sliding valve core (12) is held in an open position under the limiting of the second limiting structure.

3. The spraying machine according to claim 2, characterized in that, The switching mechanism (30) includes a rotating seat driven to rotate by the driving device (20). The rotating seat is provided with a mating groove (311). The mating groove (311) includes a first limiting groove segment (312), a second limiting groove segment (313), and a transition groove segment (314) between the first limiting groove segment (312) and the second limiting groove segment (313). The radius of the first limiting groove segment (312) is smaller than the radius of the second limiting groove segment (313), and the radius of the transition groove segment (314) is determined by the [missing information - likely a typo]. The first limiting groove segment (312) gradually increases in the direction from the second limiting groove segment (313). The sliding valve core (12) includes a valve core body (121) and a mating shaft (122) disposed at the bottom of the valve core body (121). The mating shaft (122) passes through the mating groove (311). The first limiting groove segment (312), the second limiting groove segment (313) and the transition groove segment (314) respectively form the second limiting structure, the first limiting structure and the mating structure.

4. The spraying machine according to claim 3, characterized in that, The transition groove section (314) is an arc-shaped groove.

5. The spraying machine according to claim 3, characterized in that, The rotating seat includes two turntables (31) arranged opposite to each other and a connector (32) connecting the two turntables (31). Each of the two turntables (31) is provided with a mating groove (311), and the mating grooves (311) on the two turntables (31) are opposite to each other. A clearance gap is formed between the two turntables (31) to avoid the bottom of the valve core body (121). The mating shaft (122) passes through the two opposite mating grooves (311) on the two turntables (31).

6. The spraying machine according to claim 5, characterized in that, The mating shaft (122) includes a pin that runs through the bottom of the valve core body (121). One end of the pin is provided with a shaft head (123), and the other end of the pin is provided with a cotter pin (124). The shaft head (123) and the cotter pin (124) are located on the outside of the two turntables (31), respectively.

7. The spraying machine according to claim 3, characterized in that, The rotating seat is made of polytetrafluoroethylene, nylon, or polyoxymethylene.

8. The spraying machine according to claim 2, characterized in that, The switching mechanism (30) includes a movable wedge that is driven to move by the driving device (20). The upper surface of the wedge includes a first limiting horizontal surface (33), a second limiting horizontal surface (34) that is higher than the first limiting horizontal surface (33), and an inclined surface (35) located between the first limiting horizontal surface (33) and the second limiting horizontal surface (34). The sliding valve core (12) includes a valve core body (121) and a ball (125) disposed at the bottom of the valve core body (121). The first limiting horizontal surface (33), the second limiting horizontal surface (34), and the inclined surface (35) respectively form the first limiting structure, the second limiting structure, and the mating structure.

9. The spraying machine according to claim 1, characterized in that, The spraying machine also includes a mounting base (40) disposed on the valve body (11) of the return valve (10), and the drive device (20) is mounted on the mounting base (40).

10. The spraying machine according to claim 1, characterized in that, The spraying machine also includes a pressure measuring device (50), which is installed on the valve body (11) of the return valve (10). The pressure measuring end of the pressure measuring device (50) measures the pressure in the feed channel (111) and the discharge channel (112).

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