Mobile phone shell surface spraying device

Abstract

The invention discloses a mobile phone shell surface spraying device, and belongs to the technical field of plasma spraying, the mobile phone shell surface spraying device comprises a spraying box, the upper part of the spraying box is fixedly connected with a first fan, one side, close to the first fan, of the spraying box is slidably connected with a first sliding block, and the first sliding block is fixedly connected with a plasma spray gun; a moving groove used for moving the first sliding block is formed in the side, close to the plasma spray gun, of the spraying box, the first sliding block is fixedly connected with two telescopic plates, and the telescopic plates are fixedly connected with the spraying box. According to the mobile phone shell spraying device, a mobile phone shell is placed in a closed space to be sprayed, powder generated during spraying is guided into a flow guide frame to be subsequently collected through the suction effect of a second draught fan, the mobile phone spraying quality is prevented from being affected, meanwhile, the powder is prevented from escaping into air, and pollution to the environment is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of plasma spraying, and particularly relates to a spraying device for the surface of a mobile phone shell. Background Art

[0002] With the increasing maturity of mobile phone intelligence, people's understanding of mobile phones not only stays on the performance inside the mobile phone, but also poses a severe test on the anti-drop and wear resistance of the outside of the mobile phone.

[0003] For the back cover of a mobile phone, at present, ceramic spraying technology, as an advanced surface treatment method, has been widely used in many industrial fields and has gradually been introduced into the manufacture of smart phones to improve the wear resistance and impact resistance of the mobile phone shell. Before ceramic spraying of the existing mobile phone shell, an oven or an infrared heating device is usually used to preheat the mobile phone shell. A large amount of energy is consumed in this process for the primary processing of the mobile phone shell, and the heat energy generated during the subsequent ceramic spraying of the mobile phone shell by a hot melt spray gun and the high-temperature waste gas generated during spraying cannot be effectively utilized, which is a great waste for energy utilization. Summary of the Invention

[0004] In order to solve the problem that the heat energy generated during the ceramic spraying of a mobile phone shell by a hot melt spray gun and the high-temperature waste gas generated during spraying cannot be effectively utilized, the present invention provides a spraying device for the surface of a mobile phone shell.

[0005] To achieve the above object, the present invention is realized through the following technical solutions: Mobile phone shell surface spraying device, including a spraying box, the upper part of the spraying box is fixedly connected with a first fan for cleaning the dust of the mobile phone shell before spraying. A first sliding block is slidably connected to one side of the spraying box close to the first fan. The first sliding block is fixedly connected with a plasma spray gun. A moving groove for the movement of the first sliding block is opened on one side of the spraying box close to the plasma spray gun. The first sliding block is fixedly connected with two telescopic plates, and the telescopic plates are fixedly connected with the spraying box. A first sliding frame is slidably connected to the spraying box. The first sliding frame is fixedly connected with an electric push rod. A sliding filter rack is slidably connected inside the first sliding frame, and the sliding filter rack is fixedly connected with the telescopic end of the electric push rod. A first heat conducting plate is fixedly connected to one side of the spraying box close to the sliding filter rack. A heating pipe is fixedly connected to one side of the first heat conducting plate close to the sliding filter rack. A temperature sensor is fixedly connected to the first sliding frame, and the temperature sensor is electrically connected to the electric push rod through a control module. A second sliding frame is slidably connected to one side of the spraying box close to the first fan. A plurality of placement grooves are equally spaced inside the second sliding frame. A lifting plate is slidably connected inside each placement groove. A diversion frame is fixedly connected to the spraying box. The diversion frame is fixedly connected with a second fan. The lifting plate is fixedly connected with second heat conducting plates symmetrically arranged along the lifting plate. Heat conducting ports are opened on the symmetrically arranged second heat conducting plates, and the heat conducting ports are inclined towards the diversion frame. The spraying box is provided with a moving component for driving the movement of the first sliding block.

[0006] Optionally, a plurality of strip-shaped holes are opened on the first sliding frame.

[0007] Optionally, the sliding filter rack is composed of a sliding frame and a filter net. The filter net enables the heat to be evenly transferred to the mobile phone shell, and the sliding frame is used to block the strip-shaped holes.

[0008] Optionally, the moving component includes motors symmetrically distributed along the spraying box. The motors are fixedly connected to one side of the spraying box close to the first sliding block. Screws symmetrically distributed along the spraying box are rotatably connected to the spraying box. The screws are fixedly connected with the output shafts of the adjacent motors. A second sliding block is threadedly connected to the screws, and the first sliding block is fixedly connected with the second sliding block.

[0009] Optionally, it further includes a fixed rod. The fixed rod is fixedly connected with one of the second sliding blocks. A sliding frame for locking the second sliding frame is slidably connected to one side of the spraying box close to the fixed rod. The sliding frame cooperates with the fixed rod, and a first spring is fixedly connected between the sliding frame and the spraying box.

[0010] Optionally, a limiting hole is opened on one side of the second sliding frame close to the sliding frame. When the second sliding frame is completely pushed into the spraying box, the limiting hole is aligned with the sliding frame.

[0011] Optionally, an inclined surface is arranged on one side of the sliding frame close to the fixed rod, and the fixed rod contacts the inclined surface of the sliding frame.

[0012] Optionally, it further includes a push-pull rod for pushing and pulling the lifting plate. The push-pull rod is slidably connected to the second sliding frame, and a second spring is fixedly connected between the push-pull rod and the second sliding frame. A fixed block for limiting the push-pull rod is provided on one side of the spraying box close to the second sliding frame.

[0013] Optionally, an inclined groove is formed on one side of the lifting plate close to the push-pull rod, and the inclined groove of the lifting plate is slidably connected to the push-pull rod.

[0014] Optionally, the push-pull rod is provided with a convex block, and the convex block of the push-pull rod contacts the fixed block.

[0015] Compared with the prior art, the present invention has the following advantages: When the spraying device of the present invention sprays, the waste heat in the spraying box is transferred to the mobile phone shell on the sliding filter rack through the first heat conducting plate, which plays a certain preheating role on the mobile phone shell in the first sliding frame. Through preheating, the thermal stress caused by the temperature difference during the spraying process can be reduced, avoiding coating cracking, peeling or even matrix deformation, improving the adhesion between the coating and the matrix, saving energy and avoiding waste of energy.

[0016] When the spraying device of the present invention preheats, when the preheating temperature is too high, the sliding filter rack automatically slides down along the first sliding frame, so that the mobile phone shell on the sliding filter rack automatically moves to the side away from the heating tube and the first heat conducting plate to be away from the heat source. At the same time, the strip-shaped holes at the bottom of the first sliding frame are automatically opened to accelerate the dissipation of heat. Such a synergistic effect avoids the problem of overheating of the mobile phone shell during preheating.

[0017] The present invention effectively utilizes the heat generated during spraying to quickly heat the second heat conducting plate, ensuring uniform temperature of each part of the lifting plate, improving the quality of coating spraying. After heating the second heating plate, the gas is quickly guided to the diversion frame through the heat conducting port, so that the powder mixed in the gas is quickly discharged from the inside of the equipment, ensuring the quality of spraying.

[0018] The present invention sprays the mobile phone shell in a closed space, reducing the loss of high-temperature heat and improving the quality of mobile phone shell spraying.

[0019] The present invention utilizes the suction force of the second fan to make the powder generated during spraying be diverted into the diversion frame for subsequent collection, preventing it from affecting the quality of mobile phone spraying, and at the same time preventing the powder from escaping into the air and avoiding environmental pollution.

[0020] When the present invention sprays, the second sliding frame is automatically locked to prevent the situation that during the process of pushing the second sliding frame into the spraying box and the mobile phone shell is being sprayed, the staff accidentally operates to pull out the second sliding frame forward, resulting in spraying failure.

[0021] During the process of pulling out the second sliding frame forward, by utilizing the cooperation between the push-pull rod and the inclined groove of the lifting plate, the lifting plate drives the mobile phone shell that has completed spraying to automatically move upward out of the placement groove of the second sliding frame, facilitating the removal of the mobile phone shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional structural schematic diagram of the first perspective of the present invention; Figure 2 It is a three-dimensional structural schematic diagram of the second perspective of the present invention; Figure 3 It is a three-dimensional structural schematic diagram of components such as the sliding frame, electric push rod, and first heat conducting plate of the present invention; Figure 4 It is a three-dimensional structural schematic diagram of components such as the electric push rod, sliding filter rack, and first heat conducting plate of the present invention; Figure 5 It is a three-dimensional structural schematic diagram of the sliding frame and the lifting plate of the present invention; Figure 6 It is a three-dimensional structural schematic diagram of the lifting plate and the second heat conducting plate of the present invention; Figure 7 It is a three-dimensional structural schematic diagram of components such as the sliding frame, sliding filter rack, and temperature sensor of the present invention; Figure 8 It is a separated view of the first heat conducting plate, heating tube, sliding filter rack, and first sliding frame of the present invention; Figure 9 It is a three-dimensional structural schematic diagram of components such as the motor, screw rod, and second sliding block of the present invention; Figure 10 It is a three-dimensional structural schematic diagram of components such as the fixed rod, sliding rack, and first spring of the present invention; Figure 11 It is a three-dimensional structural schematic diagram of components such as the push-pull rod, second spring, and fixed block of the present invention; Figure 12 It is a three-dimensional structural schematic diagram of components such as the lifting plate, second spring, and fixed block of the present invention.

[0023] The markings of each component in the drawings are as follows: 101: spraying box, 102: first blower, 103: first sliding block, 104: plasma spray gun, 105: telescopic plate, 106: heating tube, 107: first sliding frame, 108: electric push rod, 109: sliding filter rack, 110: first heat conducting plate, 111: temperature sensor, 112: second sliding frame, 113: lifting plate, 114: diversion frame, 115: second blower, 116: second heat conducting plate, 117: heat conducting port, 201: motor, 202: screw rod, 203: second sliding block, 301: fixed rod, 302: sliding rack, 303: first spring, 304: limiting hole, 401: push-pull rod, 402: second spring, 403: fixed block. Detailed implementation manners

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] Embodiment 1: This embodiment provides a spraying device for the surface of a mobile phone shell, as Figures 1-8As shown in the figure, it includes a spraying box 101. A first fan 102 is fixedly connected to the upper front side of the spraying box 101. The first fan 102 is used to clean the dust on the mobile phone shell before spraying. A first sliding block 103 is slidably connected to the upper part of the spraying box 101 in the front-back direction. A plasma spray gun 104 for plasma spraying the mobile phone shell is fixedly connected to the first sliding block 103. A moving groove is opened in the middle of the upper side of the spraying box 101. The first sliding block 103 moves back and forth in the moving groove. Telescopic plates 105 are fixedly connected to both the front and rear sides of the first sliding block 103. The telescopic plates 105 are used to block the moving groove of the spraying box 101. The telescopic plates 105 are fixedly connected to the spraying box 101. A first sliding frame 107 is slidably connected to the left side of the spraying box 101 in the left-right direction. A plurality of strip-shaped holes are opened at the bottom of the first sliding frame 107. An electric push rod 108 is fixedly connected to the middle of the bottom of the first sliding frame 107. A sliding filter rack 109 is slidably connected in the first sliding frame 107. The sliding filter rack 109 is composed of a sliding frame and a filter net. The filter net is used to place the mobile phone shell to be preheated, so that the heat is evenly transmitted to the mobile phone shell. The middle of the bottom of the sliding filter rack 109 is fixedly connected to the telescopic end of the electric push rod 108. The sliding frame of the sliding filter rack 109 is used to block the strip-shaped holes. A first heat conducting plate 110 is fixedly connected to one side of the spraying box 101 close to the sliding filter rack 109. The first heat conducting plate 110 is used to conduct the waste heat in the spraying box 101. A heating pipe 106 is fixedly connected to the bottom of the first heat conducting plate 110. A temperature sensor 111 is fixedly connected to the rear part of the left side of the first sliding frame 107. The temperature sensor 111 is electrically connected to the electric push rod 108 through a control module. A second sliding frame 112 is slidably connected to the upper front side of the spraying box 101. Placing grooves are arranged at equal intervals in the second sliding frame 112. A lifting plate 113 is slidably connected to each placing groove in the up-down direction. A diversion frame 114 is fixedly connected to the lower right side of the spraying box 101. The diversion frame 114 is used to divert the powder generated during spraying. A second fan 115 is fixedly connected to the top of the diversion frame 114. The second fan 115 is used to suck the powder into the diversion frame 114. Second heat conducting plates 116 are fixedly connected to the lifting plate 113 and are symmetrically arranged along the left and right sides of the lifting plate 113. The second heat conducting plates 116 are used to heat the lifting plate 113. Heat conducting openings 117 are opened at the bottoms of the symmetrically arranged second heat conducting plates 116. The heat conducting openings 117 are inclined towards the diversion frame 114 and are used to guide the hot air to be discharged from the diversion frame 114.

[0026] As Figure 9 shown, it further includes motors 201 symmetrically distributed along the left and right sides of the spraying box 101. The motors 201 are fixedly connected to the upper side of the spraying box 101. Screws 202 symmetrically distributed along the left and right sides of the spraying box 101 are rotatably connected to the upper part of the spraying box 101. The screws 202 are fixedly connected to the output shafts of the adjacent motors 201. Second sliding blocks 203 are threadedly connected to the screws 202. The first sliding block 103 is fixedly connected to the second sliding blocks 203.

[0027] Working principle: First, pull out the second sliding frame 112 forward, place the mobile phone casings to be sprayed in the respective placement slots of the second sliding frame 112. Then, push the second sliding frame 112 backward into the spraying box 101. Next, start the first blower 102 to suck out impurities such as dust on the surface of the mobile phone casing substrate. Subsequently, turn off the first blower 102, and then start the plasma spray gun 104, the motor 201, and the second blower 115. After the plasma spray gun 104 melts or semi-melts the spraying material using a high-temperature plasma jet, it is sprayed at high speed onto the surface of the mobile phone casing substrate to form a coating. During the spraying of the mobile phone casing, the generated high-temperature gas moves downward to heat the second heat-conducting plate 116. The hot gas is conducted by the second heat-conducting plate 116 to the lifting plate 113 to rapidly heat the lifting plate 113, ensuring that the temperatures of all parts of the lifting plate 113 are evenly heated. In this way, the high-temperature gas generated during spraying is effectively utilized to rapidly raise the temperature of the lifting plate 113, which also helps to improve the quality of the coating. At the same time, guided by the inclined surface of the second heat-conducting plate 116, the hot gas moves towards the heat-conducting port 117, and finally, the gas is quickly directed towards the diversion frame 114 through the heat-conducting port 117 to accelerate the discharge of the gas. Subsequently, start the motor 201. The motor 201 drives the screw 202 to rotate, thereby driving the second sliding block 203 to move from front to back, and then driving the first sliding block 103 to move from front to back, and then driving the plasma spray gun 104 to move from front to back. In this way, all the surfaces of the mobile phone casings are sprayed from front to back. At the same time, under the suction of the second blower 115, the powder generated during spraying is sucked into the diversion frame 114 for collection. The telescopic plate 105 shields at the top to prevent the powder from escaping into the air. In this way, it is ensured that the mobile phone casing is sprayed in a closed space. When the first sliding block 103 moves from front to back, the front telescopic plate 105 is stretched, and the rear telescopic plate 105 is compressed. After the spraying is completed, turn off the plasma spray gun 104 and the second blower 115, and control the motor 201 to drive the screw 202 to reverse, thereby driving the second sliding block 203 to move from back to front, and then driving the first sliding block 103 to move from back to front, and then driving the plasma spray gun 104 to move from back to front. After resetting, turn off the motor 201.

[0028] During the above spraying process, the heat dissipated by the high temperature of the plasma jet remains in the spraying chamber 101. To make full use of this heat, before spraying, the first sliding frame 107 can be pulled out upwards to the left first. The sliding filter rack 109 is pulled out along with the first sliding frame 107. Then, the next batch of mobile phone casings to be sprayed are placed on the sliding filter rack 109. Next, the first sliding frame 107 is pushed downwards to the right, and the sliding filter rack 109 is pushed under the first heat conducting plate 110 along with the first sliding frame 107. In this way, when spraying, the waste heat in the spraying chamber 101 can be transferred to the mobile phone casings on the sliding filter rack 109 through the first heat conducting plate 110, playing a certain preheating role for the mobile phone casings in the first sliding frame 107. Through preheating, the thermal stress caused by the temperature difference during the spraying process can be reduced, coating cracking, peeling, and even substrate deformation can be avoided, the adhesion between the coating and the substrate can be improved, and at the same time, energy can be saved and energy waste can be avoided. On this basis, the heating tube 106 is started to heat the mobile phone casings to the temperature required for preheating.

[0029] During the above preheating process, when the temperature sensor 111 detects that the preheating temperature is higher than the preset value, the temperature sensor 111 sends an electrical signal. The control module receives the electrical signal and controls the electric push rod 108 to shorten downwards, thereby driving the sliding filter rack 109 to slide downwards along the first sliding frame 107, making the mobile phone casings on the sliding filter rack 109 move to the side away from the heating tube 106 and the first heat conducting plate 110. At the same time, the downward sliding of the sliding filter rack 109 will cause the strip-shaped holes at the bottom of the first sliding frame 107 to open, so that the excess heat can be dissipated through the strip-shaped holes at the bottom of the first sliding frame 107. That is, the present invention can move the mobile phone casings away from the heat source and timely discharge the excess heat at the same time, and such a synergistic effect is used to avoid the problem of overheating during the preheating of the mobile phone casings.

[0030] Embodiment 2: This embodiment provides a spraying device for the surface of a mobile phone casing. On the basis of Embodiment 1, as Figure 10 shown, it further includes a fixed rod 301. The fixed rod 301 is fixedly connected to the second sliding block 203 on the right side. A sliding frame 302 is slidably connected to the upper right side of the spraying chamber 101 in the vertical direction. An inclined surface is provided on the upper side of the sliding frame 302. The fixed rod 301 contacts the inclined surface of the sliding frame 302. A first spring 303 is fixedly connected between the sliding frame 302 and the spraying chamber 101. A limiting hole 304 is opened at the front right part of the top of the second sliding frame 112. When the second sliding frame 112 is completely pushed into the spraying chamber 101, the limiting hole 304 is aligned with the sliding frame 302.

[0031] To prevent the situation where during the process of pushing the second sliding frame 112 into the spraying box 101 and while the mobile phone case is being sprayed, the staff accidentally operates to pull the second sliding frame 112 forward, resulting in spraying failure, it is necessary to automatically lock the second sliding frame 112 during the spraying process. The specific operations are as follows: After the second sliding frame 112 is pushed into the spraying box 101, the limiting hole 304 just moves backward to directly below the sliding frame 302. When the second sliding block 203 starts to move backward from front to back, it will drive the fixing rod 301 to move backward synchronously. When the fixing rod 301 disengages from the inclined surface on the upper part of the sliding frame 302, the first spring 303 in the stretched state resets and drives the sliding frame 302 to move downward and snap into the limiting hole 304, thereby locking the second sliding frame 112.

[0032] When the second sliding block 203 drives the fixing rod 301 to move forward and reset, the fixing rod 301 will squeeze the inclined surface on the upper part of the sliding frame 302, causing the sliding frame 302 to move upward and disengage from the limiting hole 304, and the first spring 303 returns to the stretched state. In this way, when the spraying is completed, the second sliding frame 112 is automatically unlocked.

[0033] Embodiment 3: This embodiment provides a spraying device for the surface of a mobile phone case. On the basis of Embodiment 2, as Figure 11 and Figure 12 shown, it further includes a push-pull rod 401. The push-pull rod 401 slides back and forth on the second sliding frame 112. An inclined slot is opened on one side of the lifting plate 113 close to the push-pull rod 401. The inclined slot of the lifting plate 113 is slidably connected to the push-pull rod 401. A second spring 402 is fixedly connected between the push-pull rod 401 and the second sliding frame 112. A fixing block 403 is provided on one side of the spraying box 101 close to the second sliding frame 112. A convex block is provided on the push-pull rod 401. The convex block of the push-pull rod 401 contacts the fixing block 403 for limiting the push-pull rod 401.

[0034] After the mobile phone case in the second sliding frame 112 is sprayed, the second sliding frame 112 is pulled forward. The lifting plate 113, the push-pull rod 401, and the second spring 402 move forward accordingly. When the convex block at the bottom of the push-pull rod 401 touches the fixing block 403 on the spraying box 101 when moving forward, the push-pull rod 401 stops moving. The second sliding frame 112 drives the lifting plate 113 to continue moving forward relative to the push-pull rod 401, and the second spring 402 is compressed. At this time, under the combined action of the push-pull rod 401 and the inclined slot of the lifting plate 113, the lifting plate 113 drives the sprayed mobile phone case to automatically move upward out of the placement slot of the second sliding frame 112, facilitating the removal of the mobile phone case.

[0035] When the second sliding frame 112 is pushed backward, the lifting plate 113, the push-pull rod 401 and the second spring 402 move backward accordingly. When the convex block at the bottom of the push-pull rod 401 disengages from the fixed block 403 backward, the second spring 402 gradually resets, causing the push-pull rod 401 to move forward relative to the second sliding frame 112 and the lifting plate 113. At this time, under the cooperation of the push-pull rod 401 and the inclined groove of the lifting plate 113, the lifting plate 113 automatically fits into the placement groove of the second sliding frame 112.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes can be made therein without departing from the principles and spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A mobile phone housing surface spraying device comprises a spraying box, a first fan is fixedly connected to the upper part of the spraying box, a first sliding block is slidably connected to a side of the spraying box close to the first fan, and a plasma spray gun is fixedly connected to the first sliding block, wherein: A moving groove for the movement of a first sliding block is opened on one side of the spray box close to the plasma spray gun, the first sliding block is fixedly connected to two telescopic plates, and the telescopic plates are fixedly connected to the spray box; the spray box is slidably connected to a first sliding frame, the first sliding frame is fixedly connected to an electric push rod, a sliding filter frame is slidably connected inside the first sliding frame, the sliding filter frame is fixedly connected to the telescopic end of the electric push rod, a first heat conducting plate is fixedly connected to one side of the spray box close to the sliding filter frame, a heating pipe is fixedly connected to the one side of the first heat conducting plate close to the sliding filter frame, and a temperature sensor is fixedly connected to the first sliding frame. The temperature sensor is electrically connected to the electric push rod through the control module; a second sliding frame is slidably connected to the side of the spray box close to the first fan, and placement slots with equal intervals are opened in the second sliding frame, and a lifting plate is slidably connected in each placement slot, the spray box is fixedly connected to a guide frame, and the guide frame is fixedly connected to the second fan, the lifting plate is fixedly connected to a second heat conduction plate symmetrically arranged along the lifting plate, and the symmetrically arranged second heat conduction plates are provided with heat conduction ports, which are inclined toward the guide frame, and the spray box is provided with a moving component for driving the first sliding block to move.

2. The mobile phone housing surface spraying device as claimed in claim 1, characterized in that: The first sliding frame is provided with a plurality of strip-shaped holes.

3. The mobile phone housing surface spraying device as claimed in claim 2, characterized in that: The sliding filter frame is composed of a sliding frame and a filter net. The filter net allows heat to be evenly transferred to the mobile phone housing, and the sliding frame is used to block the strip holes.

4. The mobile phone housing surface spraying device as claimed in claim 3, characterized in that: The moving component includes a motor symmetrically distributed along the spray box, the motor is fixed to one side of the spray box close to the first sliding block, the spray box is rotatably connected to a screw symmetrically distributed along the spray box, the screw is fixed to an adjacent motor output shaft, the screw is threadedly connected to a second sliding block, and the first sliding block is fixed to the second sliding block.

5. The mobile phone housing surface spraying device as claimed in claim 4, characterized in that: It also includes a fixed rod, which is fixedly connected to one of the second sliding blocks. A sliding frame for locking the second sliding frame is slidably connected to one side of the spray box close to the fixed rod. The sliding frame cooperates with the fixed rod, and a first spring is fixedly connected between the sliding frame and the spray box.

6. The mobile phone housing surface spraying device as claimed in claim 5, characterized in that: A limiting hole is provided on one side of the second sliding frame close to the sliding frame. When the second sliding frame is completely pushed into the spray box, the limiting hole is aligned with the sliding frame.

7. The mobile phone housing surface spraying device as claimed in claim 6, characterized in that: A slope is arranged on one side of the sliding frame close to the fixed rod, and the fixed rod contacts the slope of the sliding frame.

8. The mobile phone housing surface spraying device as claimed in claim 7, characterized in that: It also includes a push-pull rod for pushing and pulling the lifting plate, the push-pull rod is slidably connected to the second sliding frame, a second spring is fixed between the push-pull rod and the second sliding frame, and a fixed block for limiting the push-pull rod is arranged on one side of the spray box close to the second sliding frame.

9. The mobile phone housing surface spraying device as claimed in claim 8, characterized in that: An inclined groove is provided on one side of the lifting plate close to the push-pull rod, and the inclined groove of the lifting plate is slidably connected with the push-pull rod.

10. The mobile phone housing surface spraying device according to claim 9, characterized in that: The push-pull rod is provided with a protrusion, and the protrusion of the push-pull rod is in contact with the fixed block.

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