Remote control car part injection molding device based on mold cooling

Abstract

The utility model relates to the field of remote control car part injection molding, and discloses a remote control car part injection molding device based on mold cooling, which comprises a fixed mold and a movable mold corresponding to the fixed mold in a moving manner, and further comprises a lower cooling circular groove which is formed in the fixed mold and corresponds to the lower part of an injection molding cavity, a plurality of upper cooling circular grooves are formed in the fixed mold along the periphery of the injection molding cavity, and the upper cooling circular grooves are communicated with the lower cooling circular grooves; cooling pipe assemblies are arranged in the upper cooling circular groove and the lower cooling circular groove, and a moving assembly for adjusting the distance between the cooling pipe assemblies and the groove walls of the upper cooling circular groove and the lower cooling circular groove is arranged in the fixed mold; according to the injection molding device, the distance between the cooling pipe assembly and the injection molding cavity can be adjusted according to the change of the cooling time, so that the cooling effect is adjusted, and the product quality problem caused by too fast cooling and too early curing of injection molding liquid is avoided.

Description

Technical Field

[0001] The utility model relates to the field of injection molding of remote control vehicle parts, in particular to an injection molding device of remote control vehicle parts based on mold cooling. Background Art

[0002] The injection molding process of remote control car parts involves injection molds. The injection liquid is injected into the mold and waits for it to cool and solidify. The molded product is taken out by demolding. The natural cooling and solidification of the injection liquid takes a long time and is affected by factors such as ambient temperature, mold material and injection cavity shape.

[0003] Chinese patent CN213648464U discloses a fast cooling and molding injection mold, including a mounting block, a stopper fixedly connected to the top of the mounting block, and a delivery pipe located inside the stopper and extending to the outside of the mounting block on the outside of the mounting block. The fast cooling and molding injection mold drives the vertical rod to move in a direction away from the mold block by rotating the threaded sleeve, and the vertical rod drives the movable rod to move when the vertical rod moves. The movable rod is separated from the stopper after moving. At this time, the mold block is pulled upward so that the rotating plate and the fixed slot are squeezed against each other. The rotating plate is separated from the fixed slot after being squeezed and rotated, thereby separating the mold block from the mounting block. The above-mentioned existing device makes it easy to disassemble and separate the mold block and the mounting block through a series of mechanical structures, so that the delivery pipe is separated from the mold block, so that it is easy to replace the delivery pipe.

[0004] The above patent controls the rapid cooling and solidification of the injection liquid in the injection mold by passing coolant into the delivery pipe through heat exchange. However, as the cooling proceeds, the temperature of the injection liquid itself gradually decreases, and the temperature of the external cooling required needs to be regulated. If the cooling process is continuously carried out at a low temperature, the cooling speed is too fast and the plastic melt may solidify prematurely in the mold cavity, resulting in defects such as silver wire and cloud wire on the surface of the product, affecting the appearance quality of the product. Utility Model Content

[0005] In view of the above problems, a remote control car parts injection molding device based on mold cooling is provided. By moving the assembly, the distance between the cooling pipe assembly and the inner wall of the injection cavity can be adjusted according to the change of cooling time, so as to adjust the cooling effect. This solves the problem that continuous cooling treatment at a low temperature may cause the cooling speed to be too fast, and the plastic melt may solidify prematurely in the mold cavity, resulting in defects such as silver wire and cloud wire on the surface of the product, affecting the appearance quality of the product.

[0006] In order to solve the problems of the prior art, the utility model provides a remote control car component injection molding device based on mold cooling, comprising a fixed mold and a movable mold corresponding to the movement of the fixed mold, the injection molding device also comprises a lower cooling circular groove opened in the fixed mold corresponding to the lower part of the injection cavity, a plurality of upper cooling circular grooves are opened in the fixed mold along the four sides of the injection cavity, and the upper cooling circular grooves and the lower cooling circular grooves are interconnected; cooling pipe assemblies are arranged in the upper cooling circular grooves and the lower cooling circular grooves, and a movable assembly for adjusting the distance between the cooling pipe assembly and the groove walls of the upper cooling circular grooves and the lower cooling circular grooves is arranged in the fixed mold.

[0007] Preferably, the cooling pipe assembly includes a transverse curved pipe connected to the lifting and lowering control of the coolant inlet and outlet in the fixed mold, a water supply branch pipe is connected through the transverse curved pipe, a water inlet pipe is connected through the water supply branch pipe, a plurality of lifting curved pipes are telescopically connected to the water inlet pipe, a water outlet pipe is telescopically connected below the lifting curved pipe, and the water outlet pipe is fixedly installed on the fixed mold; a plurality of lifting curved pipes are arranged at equal angles along the axis of the water inlet pipe, and the distribution range of the plurality of lifting curved pipes is close to the injection cavity of the fixed mold.

[0008] Preferably, the moving component includes a moving cylinder fixedly installed in the fixed mold, a moving bracket fixedly installed at the output end of the moving cylinder, and the moving bracket is fixedly connected to the transverse curved pipe; a linkage component is provided in the fixed mold for synchronously controlling the telescopic movement of multiple lifting curved pipes beside the water inlet pipe.

[0009] Preferably, the linkage assembly includes a trapezoidal platform fixed on the fixed mold and colinear with the axis of the water inlet pipe, a plurality of slide grooves corresponding to the positions of the lifting curved pipes are opened on the trapezoidal inclined surface of the trapezoidal platform, a slider is slidably connected in the slide groove, a positioning ring is fixedly installed on the slider, and the positioning ring is fixedly sleeved on the lifting curved pipe.

[0010] Preferably, a fixed bracket is fixedly connected to the water inlet pipe, a small wiper ring is fixedly installed on the fixed bracket, the small wiper ring is in contact with the wall of the upper cooling circular groove, a large wiper ring is fixedly installed on the small wiper ring, the large wiper ring is in contact with the wall of the lower cooling circular groove.

[0011] Preferably, the fixed mold is provided with a ventilation component which is connected with the lower cooling circular groove and thereby dries the condensed water.

[0012] Preferably, the ventilation assembly includes a ventilation channel nested in the fixed mold, and ventilation grooves that are connected to the lower cooling circular groove are evenly spaced on the ventilation channel; a power cylinder is fixedly installed in the ventilation channel, and a sealing cover is fixedly connected to the output end of the power cylinder, and a mounting frame is installed on the sealing cover, and a plurality of blocks that can be engaged with the ventilation grooves are fixedly installed at equal intervals on the end surface of the mounting frame.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. The utility model adjusts the position of the cooling pipe assembly in the lower cooling circular groove and the upper cooling circular groove by moving the moving assembly. According to the progress of the cooling time, the moving assembly controls the transverse curved pipe and the lifting curved pipe to move away from the injection cavity in the fixed mold, thereby reducing the cooling effect of the cooling pipe assembly on the injection cavity, and avoiding the situation where the plastic melt in the injection cavity solidifies prematurely due to excessive cooling speed under a continuous low temperature state;

[0015] 2. The utility model can dry the condensed water in the lower cooling circular groove and the upper cooling circular groove through the ventilation component. Due to the change of hot and cold temperatures during the cooling process, condensed water appears on the groove walls of the lower cooling circular groove and the upper cooling circular groove in the fixed mold. The condensed water on the groove walls can be cleaned by the small wiper ring and the large wiper ring, and the drying of the condensed water in the lower cooling circular groove can be accelerated by the through ventilation component, so as to avoid the condensed water being distributed in the fixed mold to cause corrosion, which affects the subsequent cooling effect of the fixed mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the fixed mold three-dimensional structure of a remote control car component injection molding device based on mold cooling;

[0017] Figure 2 It is a schematic diagram of the fixed mold cross-section structure of a remote control car component injection molding device based on mold cooling;

[0018] Figure 3 It is a schematic diagram of the cross-sectional structure of the upper cooling circular groove of a remote control car component injection molding device based on mold cooling;

[0019] Figure 4 It is a schematic diagram of a top view of a transverse curved pipe structure of a remote control vehicle component injection molding device based on mold cooling;

[0020] Figure 5 It is a schematic diagram of the three-dimensional structure of a lifting curved pipe of a remote control car component injection molding device based on mold cooling;

[0021] Figure 6 It is a schematic diagram of the three-dimensional structure of a mobile bracket of a remote control car component injection molding device based on mold cooling;

[0022] Figure 7 It is a schematic diagram of the three-dimensional structure of a trapezoidal platform of a remote control car component injection molding device based on mold cooling;

[0023] Figure 8 It is a schematic diagram of the three-dimensional structure of a positioning ring of a remote control car component injection molding device based on mold cooling;

[0024] Fig. 9 It is a schematic diagram of the three-dimensional structure of a slider of a remote control car component injection molding device based on mold cooling;

[0025] Fig.10 The present invention is a schematic diagram of the three-dimensional structure of a card block of a remote control car component injection molding device based on mold cooling.

[0026] The numbers in the figure are: 11, fixed mold; 12, movable mold; 21, lower cooling circular groove; 22, upper cooling circular groove; 23, cooling pipe assembly; 231, horizontal curved pipe; 232, water supply branch pipe; 233, water inlet pipe; 234, lifting curved pipe; 235, water outlet pipe; 24, moving assembly; 241, moving cylinder; 242, moving bracket; 243, linkage assembly; 2431, trapezoidal table; 2432, slide groove; 2433, slider; 2434, positioning ring; 251, fixed bracket; 252, small wiper ring; 253, large wiper ring; 3, ventilation assembly; 31, ventilation channel; 32, ventilation groove; 33, power cylinder; 34, sealing cover; 35, mounting bracket; 36, block. DETAILED DESCRIPTION

[0027] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] See also Figure 1-Figure 6 As shown, a remote control car component injection molding device based on mold cooling includes a fixed mold 11 and a movable mold 12 corresponding to the movement of the fixed mold 11. The injection molding device also includes a lower cooling circular groove 21 opened in the fixed mold 11 corresponding to the lower part of the injection cavity. A plurality of upper cooling circular grooves 22 are opened in the fixed mold 11 along the periphery of the injection cavity, and the upper cooling circular grooves 22 and the lower cooling circular grooves 21 are interconnected; cooling pipe assemblies 23 are provided in the upper cooling circular grooves 22 and the lower cooling circular grooves 21, and a movable assembly 24 for adjusting the distance between the cooling pipe assembly 23 and the groove walls of the upper cooling circular grooves 22 and the lower cooling circular grooves 21 is provided in the fixed mold 11.

[0029] The fixed mold 11 and the movable mold 12 are combined with each other, and the injection liquid is injected into the injection cavity which is closed after the fixed mold 11 and the movable mold 12 are combined. The coolant is introduced into the cooling pipe assembly 23 through the water inlet and outlet on the fixed mold 11, and the coolant is controlled to circulate in the cooling pipe assembly 23. The cooling pipe assembly 23 is distributed near the injection cavity of the fixed mold 11. The cooling pipe assembly 23 forms heat exchange with the outer wall of the injection cavity, which quickly reduces the temperature of the injection liquid in the injection cavity and helps the injection liquid to cool and solidify.

[0030] As cooling proceeds, the temperature of the injection liquid itself gradually decreases. While controlling the temperature of the coolant circulating in and out of the cooling pipe assembly 23, the cooling pipe assembly 23 is controlled by the moving assembly 24 to move away from the injection cavity of the fixed mold 11, thereby reducing the cooling effect and avoiding the defect of premature solidification caused by the injection liquid cooling too quickly.

[0031] See also Figure 2-Figure 7 As shown, the cooling pipe assembly 23 includes a transverse curved pipe 231 connected to the fixed mold 11 for controlling the lifting of the coolant inlet and outlet, a water supply branch pipe 232 is connected through the transverse curved pipe 231, a water supply branch pipe 232 is connected through the water supply branch pipe 233, a plurality of lifting curved pipes 234 are telescopically connected to the water inlet pipe 233, a water outlet pipe 235 is telescopically connected below the lifting curved pipe 234, and the water outlet pipe 235 is fixedly installed on the fixed mold 11; a plurality of lifting curved pipes 234 are arranged at equal angles along the axis of the water inlet pipe 233, and the distribution range of the plurality of lifting curved pipes 234 is close to the injection cavity of the fixed mold 11.

[0032] The fixed mold 11 is equipped with water inlets and outlets for controlling the flow of coolant. The transverse curved pipe 231 is connected to the inlet and outlet lifting and lowering. Part of the coolant in the transverse curved pipe 231 flows into the lifting curved pipe 234 through the water supply branch pipe 232 and the water inlet pipe 233. Finally, the coolant in the lifting curved pipe 234 is discharged outward through the outlet pipe 235. The transverse curved pipe 231 is attached to the bottom of the injection cavity of the fixed mold 11, and the lifting curved pipe 234 is distributed on the side wall of the injection cavity of the fixed mold 11. The combination of the transverse curved pipe 231 and the lifting curved pipe 234 can quickly adjust the temperature in the injection cavity of the fixed mold 11, thereby assisting the cooling and solidification of the injection liquid.

[0033] See also Figure 2-Figure 9 As shown, the moving component 24 includes a moving cylinder 241 fixedly installed in the fixed mold 11, and a moving bracket 242 is fixedly installed at the output end of the moving cylinder 241, and the moving bracket 242 is fixedly connected to the transverse curved pipe 231; the fixed mold 11 is provided with a linkage component 243 for synchronously controlling multiple lifting curved pipes 234 to telescope and move beside the water inlet pipe 233.

[0034] The movable cylinder 241 is operated to push the movable bracket 242 to move up and down, and the movable bracket 242 controls the transverse curved pipe 231 to move up and down. The transverse curved pipe 231 drives the water delivery branch pipe 232, the water inlet pipe 233 and the lifting curved pipe 234 to move up and down synchronously. During the lifting and lowering movement of the lifting curved pipe 234, the linkage component 243 can control the lifting curved pipe 234 to move telescopically beside the water inlet pipe 233, so as to adjust the distance between the transverse curved pipe 231 and the bottom of the injection cavity, and at the same time adjust the distance between the lifting curved pipe 234 and the side of the injection cavity.

[0035] See also Figure 5-Figure 9 As shown, the linkage assembly 243 includes a trapezoidal platform 2431 fixed on the fixed mold 11 and colinear with the axis of the water inlet pipe 233, a plurality of slide grooves 2432 corresponding to the position of the lifting curved pipe 234 are opened on the trapezoidal inclined surface of the trapezoidal platform 2431, a slider 2433 is slidably connected in the slide groove 2432, a positioning ring 2434 is fixedly installed on the slider 2433, and the positioning ring 2434 is fixedly sleeved on the lifting curved pipe 234.

[0036] The lifting curved tube 234 drives the positioning ring 2434 to move synchronously during the lifting and lowering movement, and the positioning ring 2434 pushes the slider 2433 to engage in the slide groove 2432 and slide. Since the slide groove 2432 is set on the inclined surface of the trapezoidal platform 2431, the slider 2433 drives the positioning ring 2434 and the lifting curved tube 234 to have a horizontal displacement during the sliding process, so that the lifting curved tube 234 connected to the water inlet pipe 233 can be telescopically moved, thereby adjusting the distance between the lifting curved tube 234 and the inside of the injection cavity.

[0037] See also Figure 2-Figure 5 As shown, a fixed bracket 251 is fixedly connected to the water inlet pipe 233, a small wiper ring 252 is fixedly installed on the fixed bracket 251, the small wiper ring 252 is in contact with the wall of the upper cooling circular groove 22, a large wiper ring 253 is fixedly installed on the small wiper ring 252, the large wiper ring 253 is in contact with the wall of the lower cooling circular groove 21.

[0038] During the process of controlling the lifting and lowering movement of the transverse curved pipe 231, the transverse curved pipe 231 drives the water inlet pipe 233, the fixed bracket 251, the small wiper ring 252, and the large wiper ring 253 to move synchronously. The small wiper ring 252 moves in contact with the wall of the upper cooling circular groove 22, and the large wiper ring 253 moves in contact with the wall of the lower cooling circular groove 21, so as to clean up the condensed water generated by cooling on the walls of the lower cooling circular groove 21 and the upper cooling circular groove 22, so that the condensed water is concentrated at the bottom of the lower cooling circular groove 21, so as to prevent the condensed water from corroding the inner wall of the fixed mold 11 and affecting the cooling effect of subsequent mold use.

[0039] See also Figure 2 , Figure 3 and Fig.10 As shown, a ventilation component 3 is provided in the fixed mold 11, which is connected with the lower cooling circular groove 21 and thus condensed water is dried by air.

[0040] Opening the ventilation assembly 3 can accelerate the processing of condensed water at the bottom of the lower cooling circular groove 21.

[0041] See also Figure 2 , Figure 3 and Fig.10 As shown, the ventilation assembly 3 includes a ventilation channel 31 nested in the fixed mold 11, and ventilation grooves 32 that penetrate the lower cooling circular groove 21 are evenly spaced on the ventilation channel 31; a power cylinder 33 is fixedly installed in the ventilation channel 31, and a sealing cover 34 is fixedly connected to the output end of the power cylinder 33, and a mounting frame 35 is installed on the sealing cover 34, and a plurality of blocks 36 that can be snap-connected with the ventilation grooves 32 are fixedly installed at equal intervals on the end surface of the mounting frame 35.

[0042] The operating power cylinder 33 pushes the sealing cover 34 to move out of the ventilation channel 31. The sealing cover 34 drives the block 36 to move synchronously through the mounting frame 35, so that the block 36 moves and separates from the ventilation groove 32. The ventilation grooves 32 are distributed on the front and rear sides of the lower cooling circular groove 21, so that the gas in the lower cooling circular groove 21 and the external environment gas can convect with each other, accelerating the drying of condensed water at the bottom of the lower cooling circular groove 21, and avoiding corrosion caused by moisture in the groove walls of the lower cooling circular groove 21 and the upper cooling circular groove 22.

[0043] Working principle: When performing injection molding of remote control car parts, the fixed mold 11 and the movable mold 12 are controlled to be combined with each other, and the injection liquid is injected into the combined injection cavity. The temperature of the injection liquid in the injection cavity is regulated by the cooling pipe assembly 23 to accelerate the cooling and solidification of the injection liquid.

[0044] The transverse curved tube 231 and the lifting curved tube 234 in the cooling tube assembly 23 are distributed at the bottom and side of the injection cavity, and the coolant is controlled to circulate in the transverse curved tube 231 and the lifting curved tube 234. The temperature of the injection liquid in the injection cavity is regulated by heat exchange. As the cooling time increases, the moving cylinder 241 is operated to control the moving bracket 242 to move downward, and the moving bracket 242 drives the transverse curved tube 231 to move away from the bottom of the injection cavity, thereby reducing the cooling effect. The transverse curved tube 231 moves downward while driving the water supply. The branch pipe 232, the water inlet pipe 233 and the lifting curved pipe 234 move downward synchronously. During the downward movement of the lifting curved pipe 234, the positioning ring 2434 pushes the slider 2433 to engage in the slide groove 2432 and slide obliquely. At this time, the lifting curved pipe 234 is displaced in the horizontal direction. The lifting curved pipe 234 is connected to the water inlet pipe 233 and moves inward, so that the lifting curved pipe 234 moves away from the side wall of the injection cavity, further reducing the cooling effect, and avoiding the injection liquid in the injection cavity from cooling too fast and curing prematurely.

[0045] During the cooling process, due to the changes in hot and cold temperatures, condensed water is generated on the walls of the lower cooling circular groove 21 and the upper cooling circular groove 22. While controlling the lateral curved pipe 231 to move downward, the fixed bracket 251, the small wiper ring 252 and the large wiper ring 253 are driven to move downward synchronously through the water inlet pipe 233. The small wiper ring 252 and the large wiper ring 253 respectively clean up the condensed water on the walls of the upper cooling circular groove 22 and the lower cooling circular groove 21, thereby achieving preliminary treatment of the condensed water.

[0046] The operating power cylinder 33 pushes the sealing cover 34 and the mounting bracket 35 to move outside the ventilation channel 31, and the mounting bracket 35 drives the block 36 to move away from the ventilation groove 32. At this time, the ventilation grooves 32 on both sides of the lower cooling circular groove 21 are in a through state. The ventilation grooves 32 can control the flow of internal and external gases to achieve air drying of the condensed water in the lower cooling circular groove 21.

[0047] The above embodiments only express one or several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the attached claims.

Claims

1. A remote control car component injection molding device based on mold cooling, comprising a fixed mold (11) and a movable mold (12) corresponding to the movement of the fixed mold (11), characterized in that: The injection molding device also includes a lower cooling circular groove (21) provided in the fixed mold (11) and corresponding to the lower portion of the injection cavity; a plurality of upper cooling circular grooves (22) are provided in the fixed mold (11) along the periphery of the injection cavity; the upper cooling circular grooves (22) and the lower cooling circular grooves (21) are interconnected; cooling pipe assemblies (23) are provided in the upper cooling circular grooves (22) and the lower cooling circular grooves (21); and a moving assembly (24) for adjusting the distance between the cooling pipe assembly (23) and the groove walls of the upper cooling circular grooves (22) and the lower cooling circular grooves (21) is provided in the fixed mold (11).

2. A remote control car component injection molding device based on mold cooling according to claim 1, characterized in that: The cooling pipe assembly (23) comprises a transverse curved pipe (231) connected to a cooling liquid inlet and outlet in the fixed mold (11) for controlling the lifting of the cooling liquid; a water supply branch pipe (232) is connected through the transverse curved pipe (231); a water supply branch pipe (232) is connected through the water supply branch pipe (232); a water inlet pipe (233) is connected through the water inlet pipe (233); a plurality of lifting curved pipes (234) are telescopically connected to the water inlet pipe (233); a water outlet pipe (235) is telescopically connected below the lifting curved pipe (234); and the water outlet pipe (235) is fixedly mounted on the fixed mold (11); a plurality of lifting curved pipes (234) are arranged at equal angles along the axis of the water inlet pipe (233); and the plurality of lifting curved pipes (234) are distributed in a range close to the injection molding cavity of the fixed mold (11).

3. A remote control car component injection molding device based on mold cooling according to claim 2, characterized in that: The moving assembly (24) comprises a moving cylinder (241) fixedly mounted in the fixed mold (11); a moving bracket (242) is fixedly mounted on the output end of the moving cylinder (241); the moving bracket (242) is fixedly connected to the transverse curved pipe (231); and a linkage assembly (243) is provided in the fixed mold (11) for synchronously controlling the telescopic movement of a plurality of lifting curved pipes (234) beside the water inlet pipe (233).

4. A remote control car component injection molding device based on mold cooling according to claim 3, characterized in that: The linkage assembly (243) comprises a trapezoidal platform (2431) fixed on the fixed mold (11) and colinear with the axis of the water inlet pipe (233); a plurality of slide grooves (2432) corresponding to the positions of the lifting curved pipe (234) are provided on the trapezoidal inclined surface of the trapezoidal platform (2431); a slider (2433) is slidably connected in the slide groove (2432); a positioning ring (2434) is fixedly mounted on the slider (2433); and the positioning ring (2434) is fixedly sleeved on the lifting curved pipe (234).

5. A remote control car component injection molding device based on mold cooling according to claim 2, characterized in that: A fixed bracket (251) is fixedly connected to the water inlet pipe (233), a small wiper ring (252) is fixedly mounted on the fixed bracket (251), the small wiper ring (252) and the groove wall of the upper cooling circular groove (22) are mutually fitted, a large wiper ring (253) is fixedly mounted on the small wiper ring (252), and the large wiper ring (253) and the groove wall of the lower cooling circular groove (21) are mutually fitted.

6. A remote control car component injection molding device based on mold cooling according to claim 1, characterized in that: The fixed mold (11) is provided with a ventilation component (3) which is connected to the lower cooling circular groove (21) and thereby dries condensed water.

7. A remote control car component injection molding device based on mold cooling according to claim 6, characterized in that: The ventilation assembly (3) comprises a ventilation channel (31) nested in the fixed mold (11), and ventilation grooves (32) that are connected to the lower cooling circular groove (21) are arranged at equal intervals on the ventilation channel (31); a power cylinder (33) is fixedly installed in the ventilation channel (31), and a sealing cover (34) is fixedly connected to the output end of the power cylinder (33), and a mounting frame (35) is installed on the sealing cover (34), and a plurality of clamping blocks (36) that can be engaged with the ventilation grooves (32) are fixedly installed at equal intervals on the end surface of the mounting frame (35).

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