Feeding device for rubber tire forming vulcanizing machine

Abstract

The utility model relates to the field of rubber tire forming equipment, in particular to a feeding device for a rubber tire forming vulcanizing machine. The feeding device for the rubber tire forming vulcanizing machine comprises a moving assembly. A second motor is started to enable an output shaft of the second motor to drive a first rotating disc to rotate, particles located at the upper end of the first rotating disc can fall out through a second discharging groove and fall out through a gap between the second rotating disc and a second groove body, the motor is started to enable the second rotating disc to rotate, and the position of a check block can be changed; and therefore, annular discharging is formed, the particles can be conveniently and rapidly filled into an annular mold, and the problem that rubber mixture particles cannot be conveniently and rapidly injected into the mold through a feeding device in the prior art is solved.

Description

Technical Field

[0001] The utility model belongs to the field of feeding devices, and in particular relates to a feeding device for a rubber tire molding vulcanizer. Background Art

[0002] In modern industrial production, the manufacture of rubber tires is a key link, and its product quality directly affects the safety performance and service life of the vehicle. In this process, the rubber tire molding vulcanizer plays a vital role. The current feeding device of the rubber tire molding vulcanizer usually conveys the unmolded rubber mixture to the molding mold of the vulcanizer through a conveyor belt. During the operation of the vulcanizer, the rubber mixture will be evenly placed in the molding mold and vulcanized under high temperature and high pressure conditions to finally form a molded rubber tire. However, the feeding device in the prior art is not convenient for quickly injecting the rubber mixture particles into the mold. After the rubber mixture particles are fed, the feeding mechanism is difficult to fill quickly, which needs further improvement.

[0003] At present, the utility model with patent number CN202321285153.6 discloses a vulcanizer for rubber tire production, including a base for installing the vulcanizer, a first fixing column and a second fixing column are symmetrically fixedly connected to the upper end of the base, and the first fixing column and the second fixing column are provided with a slide groove on the opposite side walls, a first screw rod is rotatably connected in the slide groove provided on the first fixing column, and a cross bar is slidably connected between the first fixing column and the second fixing column. The device can realize the loading, vulcanization and demolding of the rubber tire only with manual assistance, which greatly reduces the labor intensity of the workers and improves the vulcanization efficiency of the rubber tire. However, the loading device in the prior art is not convenient for quickly injecting the rubber mixture particles into the mold. After the rubber mixture particles are loaded, it is difficult for the loading mechanism to fill them quickly. Utility Model Content

[0004] In order to overcome the problem that the feeding device in the prior art is not convenient for quickly injecting the rubber mixture particles into the mold, after the rubber mixture particles are fed, the feeding mechanism is difficult to fill quickly.

[0005] The technical solution of the utility model is:

[0006] A feeding device for a rubber tire molding vulcanizer includes a moving component; a pushing component, a feeding component, a lifting component and a feeding component; a pushing component for pushing is arranged at the upper end of the moving component; a feeding component for feeding is arranged on the pushing component; a lifting component for lifting the feeding component is arranged on the pushing component; and a feeding component for pushing particles in the feeding component is arranged on the lifting component.

[0007] Preferably, when in use, the rubber mixture particles are injected into the loading component through the feeding component, and then the feeding component is turned on to push the particles so that the particles can fall into the loading component more evenly, and then the moving component is turned on to make the pushing component move backward, and then the pushing component is turned on to push the loading component backward, and the particles in the loading component will fall into the mold through the pushing component, and then the moving component is turned on to make the pushing component move forward, and the pushing component is turned on to make the loading component move forward, and the loading component can be quickly added again when the feeding component is aligned with the feeding component, which solves the problem that the feeding device in the prior art is not convenient for quickly injecting the rubber mixture particles into the mold, and the feeding mechanism is difficult to fill quickly after the rubber mixture particles are fed.

[0008] Preferably, the moving assembly includes a supporting platform, a first U-shaped plate, a first bearing seat, a first motor, a screw, a second bearing seat, a threaded sleeve and a moving block; the upper end of the supporting platform is fixedly connected to the first U-shaped plate; the upper end of the first U-shaped plate is fixedly connected to the first bearing seat and the second bearing seat; the front end of the first bearing seat is fixedly connected to the first motor; the rear end of the output shaft of the first motor passes through the first bearing seat and is fixedly connected to the screw; the rear end outer wall of the screw is fitted with the inner wall of the second bearing seat; the outer wall of the screw is movably mounted with the threaded sleeve; the outer wall of the threaded sleeve is fixedly connected to the moving block, and when the pushing assembly needs to be moved forward and backward, the first motor is turned on to rotate the screw, and the threaded sleeve moves forward and backward along the outer wall of the screw, so that the pushing assembly can be driven to move forward and backward through the moving block.

[0009] Preferably, the pushing assembly includes a second U-shaped plate, a first electric cylinder and a first feeding trough; the second U-shaped plate is fixedly connected to the upper end of the moving block; the lower end surface of the second U-shaped plate is in contact with the upper end surface of the first U-shaped plate; the upper end of the second U-shaped plate is fixedly connected to the first electric cylinder, and when it is necessary to move the feeding assembly backward, the first electric cylinder is turned on so that the output shaft of the first electric cylinder extends from the cylinder body, thereby driving the feeding assembly to move backward.

[0010] Preferably, the loading assembly includes a moving frame, a first trough body, a second trough body, a first connecting block, a third trough body, a second motor, a fixed disk, a protective disk, a groove, a motor, a first rotating disk, a second unloading trough, a second rotating disk and a stop block; the rear end of the output shaft of the first electric cylinder is fixedly connected to the moving frame; the upper end of the moving frame is provided with a first trough body; the lower end of the first trough body is penetrated by a second trough body; the second trough body is a cylindrical trough body; the front and rear ends of the inner wall of the moving frame are fixedly connected to the first connecting block; one end of the two first connecting blocks close to the center of the moving frame is fixedly connected to the second motor; the lower ends of the two first connecting blocks are fixedly connected to the fixed disk; the fixed disk is annular; the inner wall of the fixed disk is in contact with the outer wall of the second motor; the upper end of the second motor is fixedly connected to the protective disk; the lower end of the output shaft of the second motor is provided with a groove; the inner wall of the groove is fixedly connected to the motor; the lower end of the output shaft of the second motor A first rotating disk is fixedly connected; a second material discharge trough is provided at the upper and lower ends of the first rotating disk; the lower end of the output shaft of the motor passes through the first rotating disk and is fixedly connected to the second rotating disk; a stopper is fixedly connected to the outer wall of the second rotating disk; one end of the stopper away from the center of the second rotating disk is in contact with the inner wall of the second trough body; the top surface area of ​​the stopper is larger than the top surface area of ​​the second material discharge trough. By using the stopper to block the second material discharge trough, it is convenient to feed the upper end of the first rotating disk. When it is necessary to feed downward, the second motor is turned on so that the output shaft of the second motor drives the first rotating disk to rotate, and the particles located at the upper end of the first rotating disk will fall downward through the second material discharge trough, and the particles fall downward through the gap between the second rotating disk and the second trough body. When the motor is turned on to make the second rotating disk rotate, the position of the stopper can be changed, thereby forming an annular material discharge, which is convenient and quick to fill the particles into the annular mold.

[0011] Preferably, the outer wall of the first rotating disk fits with the inner wall of the second trough body; the outer diameter of the second rotating disk is smaller than the inner diameter of the second trough body, and the arrangement of the outer wall of the first rotating disk fitting with the inner wall of the second trough body can facilitate supporting the particles at the upper end of the first rotating disk.

[0012] Preferably, the lifting assembly includes a third electric cylinder and a lifting block; the left and right ends of the second U-shaped plate are fixedly connected to the third electric cylinder; the upper end of the output shaft of the third electric cylinder is fixedly connected to the lifting block, and when the feeding assembly needs to be lifted, the third electric cylinder is turned on to move the lifting block upward, so that the feeding assembly can be quickly lifted and lowered.

[0013] Preferably, the feeding assembly includes a movable frame, a second connecting block, a fourth motor and a fixed arm; the movable frame is fixedly connected to one end of the two lifting blocks that are close to each other; the second connecting block is fixedly connected to the inner wall of the movable frame; the fourth motor is fixedly connected to the inner wall of the second connecting block; the fixed arm is fixedly connected to the lower end of the output shaft of the fourth motor; the lower end surface of the movable frame is fitted with the upper end surface of the movable frame; the inner wall of the movable frame and the inner wall of the movable frame are in the same plane; the lower end surface of the fixed arm is fitted with the upper end surface of the protective disk, and the particles are put into the interior of the movable frame through the movable frame, and then the fourth motor is turned on to rotate the fixed arm, and the fixed arm will rotate on the upper end surface of the protective disk, which can facilitate the pushing of the particles put into the movable frame, so that the particles can be placed in the second trough body relatively flat.

[0014] Beneficial effects of the utility model:

[0015] 1. By setting a stopper and using the stopper to block the second material discharge trough, it is convenient to feed the material to the upper end of the first rotating disk. When it is necessary to feed the material downward, the second motor is turned on so that the output shaft of the second motor drives the first rotating disk to rotate, and the particles at the upper end of the first rotating disk will fall downward through the second material discharge trough, and the particles fall downward through the gap between the second rotating disk and the second trough body. The motor is turned on to rotate the second rotating disk, and the position of the stopper can be changed, thereby forming an annular material discharge, which is convenient and fast to fill the particles into the annular mold, solving the problem that the feeding device in the prior art is not convenient to quickly inject the rubber mixture particles into the mold;

[0016] 2. By turning on the first motor to rotate the screw rod, the thread sleeve moves forward and backward along the outer wall of the screw rod, and the moving block can be used to drive the push assembly to move forward and backward. By turning on the first electric cylinder to extend the output shaft of the first electric cylinder from the cylinder body, the feeding assembly can be driven to move backward, which is convenient for quickly moving the position of the feeding assembly of the device, thereby facilitating the rapid feeding of materials into the mold;

[0017] 3. When it is necessary to lift the feeding assembly, start the third electric cylinder to move the lifting block upward, and then the feeding assembly can be quickly lifted and lowered, and the particles are put into the interior of the moving frame through the movable frame, and then the fourth motor is turned on to rotate the fixed arm. The fixed arm will rotate on the upper end surface of the protective plate, which can facilitate the pushing of the particles put into the moving frame, so that the particles can be placed relatively flat in the second tank body. The moving assembly and the push assembly can be used to facilitate the rapid filling of the feeding assembly, which solves the problem that the feeding mechanism is difficult to quickly fill after the rubber mixture particles are fed by the feeding device in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 What is shown is a three-dimensional structural schematic diagram of the utility model;

[0019] Figure 2What is shown is a three-dimensional structural schematic diagram of the mobile component in the utility model;

[0020] Figure 3 The three-dimensional structure diagram of the push assembly and the lifting assembly in the utility model is shown;

[0021] Figure 4 What is shown is a three-dimensional structural schematic diagram of the feeding assembly in the utility model;

[0022] Figure 5 What is shown is a cross-sectional three-dimensional structural schematic diagram of the movable frame in the utility model;

[0023] Figure 6 The figure shows a three-dimensional structure diagram of the second rotating disk in the present invention;

[0024] Figure 7 What is shown is a three-dimensional structural schematic diagram of the feeding component in the utility model.

[0025] The markings in the attached drawings are: 1-moving assembly; 101-carrying platform; 102-first U-shaped plate; 103-first bearing seat; 104-first motor; 105-screw rod; 106-second bearing seat; 107-screw sleeve; 108-moving block; 2-pushing assembly; 201-second U-shaped plate; 202-first electric cylinder; 203-first unloading trough; 3-loading assembly; 301-moving frame; 302-first trough body; 303-second trough body; 304- The first connecting block; 305-the third trough body; 306-the second motor; 307-the fixed plate; 308-the protective plate; 309-the groove; 310-the motor; 311-the first rotating plate; 312-the second feeding trough; 313-the second rotating plate; 314-the stopper; 4-the lifting assembly; 401-the third electric cylinder; 402-the lifting block; 5-the feeding assembly; 501-the movable frame; 502-the second connecting block; 503-the fourth motor; 504-the fixed arm. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0027] See also Figure 1 The utility model provides an embodiment: a feeding device for a rubber tire molding vulcanizer, including a moving component 1; also including a pushing component 2, a feeding component 3, a lifting component 4 and a feeding component 5; the upper end of the moving component 1 is provided with a pushing component 2 for pushing; the feeding component 3 for feeding is provided on the pushing component 2; the lifting component 4 for lifting the feeding component 5 is provided on the pushing component 2; the feeding component 5 for pushing the particles in the feeding component 3 is provided on the lifting component 4.

[0028] See also Figure 2In this embodiment, the moving component 1 includes a supporting platform 101, a first U-shaped plate 102, a first bearing seat 103, a first motor 104, a screw 105, a second bearing seat 106, a threaded sleeve 107 and a moving block 108; the upper end of the supporting platform 101 is fixedly connected to the first U-shaped plate 102; the upper end of the first U-shaped plate 102 is fixedly connected to the first bearing seat 103 and the second bearing seat 106; the front end of the first bearing seat 103 is fixedly connected to the first motor 104; the rear end of the output shaft of the first motor 104 passes through the first bearing seat 103 and is fixedly connected to the screw 105; the rear end outer wall of the screw 105 is in contact with the inner wall of the second bearing seat 106; the outer wall of the screw 105 is movably mounted with a threaded sleeve 107; the outer wall of the threaded sleeve 107 is fixedly connected to the moving block 108.

[0029] See also Figure 3 In this embodiment, the pushing assembly 2 includes a second U-shaped plate 201, a first electric cylinder 202 and a first material discharge chute 203; the upper end of the moving block 108 is fixedly connected to the second U-shaped plate 201; the lower end surface of the second U-shaped plate 201 is in contact with the upper end surface of the first U-shaped plate 102; the upper end of the second U-shaped plate 201 is fixedly connected to the first electric cylinder 202.

[0030] See also Figure 4-6In the present embodiment, the loading assembly 3 comprises a moving frame 301, a first slot body 302, a second slot body 303, a first connecting block 304, a third slot body 305, a second motor 306, a fixed disk 307, a protective disk 308, a groove 309, a motor 310, a first rotating disk 311, a second unloading slot 312, a second rotating disk 313 and a stopper 314; the rear end of the output shaft of the first electric cylinder 202 is fixedly connected with the moving frame 301; the upper end of the moving frame 301 is provided with a first slot body 302; the lower end of the first slot body 302 is penetrated by a second slot body 303; the second slot body 303 is a cylindrical slot body; the front and rear ends of the inner wall of the moving frame 301 are fixedly connected with the first connecting block 304; one end of the two first connecting blocks 304 close to the center of the moving frame 301 is fixedly connected with the second motor 306; the lower ends of the two first connecting blocks 304 are fixedly connected with the fixed disk 307; the fixed disk 307 is annular; The inner wall of the fixed plate 307 is fitted with the outer wall of the second motor 306; a protective plate 308 is fixedly connected to the upper end of the second motor 306; a groove 309 is provided at the lower end of the output shaft of the second motor 306; a motor 310 is fixedly connected to the inner wall of the groove 309; a first rotating plate 311 is fixedly connected to the lower end of the output shaft of the second motor 306; a second material discharge chute 312 is penetrated through the upper and lower ends of the first rotating plate 311; the lower end of the output shaft of the motor 310 penetrates the first rotating plate 311 and is fixedly connected to the second rotating plate 313; a stopper 314 is fixedly connected to the outer wall of the second rotating plate 313; one end of the stopper 314 away from the center of the second rotating plate 313 is fitted with the inner wall of the second trough body 303; the top surface area of ​​the stopper 314 is larger than the top surface area of ​​the second material discharge chute 312, and the outer wall of the first rotating plate 311 is fitted with the inner wall of the second trough body 303; the outer diameter of the second rotating plate 313 is smaller than the inner diameter of the second trough body 303.

[0031] See also Figure 3 In this embodiment, the lifting assembly 4 includes a third electric cylinder 401 and a lifting block 402; the left and right ends of the second U-shaped plate 201 are fixedly connected to the third electric cylinder 401; the upper end of the output shaft of the third electric cylinder 401 is fixedly connected to the lifting block 402.

[0032] See also Figure 7 In the present embodiment, the feeding assembly 5 comprises a movable frame 501, a second connecting block 502, a fourth motor 503 and a fixed arm 504; the ends of the two lifting blocks 402 close to each other are fixedly connected with the movable frame 501; the inner wall of the movable frame 501 is fixedly connected with the second connecting block 502; the inner wall of the second connecting block 502 is fixedly connected with the fourth motor 503; the lower end of the output shaft of the fourth motor 503 is fixedly connected with the fixed arm 504; the lower end surface of the movable frame 501 is in contact with the upper end surface of the moving frame 301; the inner wall of the movable frame 501 and the inner wall of the moving frame 301 are in the same plane; the lower end surface of the fixed arm 504 is in contact with the upper end surface of the protective plate 308.

[0033] When working, first, the particles are put into the inside of the moving frame 301 through the movable frame 501, and then the fourth motor 503 is turned on to rotate the fixed arm 504, and the fixed arm 504 will rotate on the upper end surface of the protective plate 308, so as to push the particles put into the moving frame 301, so that the particles can be placed relatively flat in the second tank body 303;

[0034] Then, the first motor 104 is turned on to rotate the screw rod 105, and the screw sleeve 107 moves forward and backward along the outer wall of the screw rod 105, and the push assembly 2 is driven to move forward and backward through the moving block 108, and then the first electric cylinder 202 is turned on to make the output shaft of the first electric cylinder 202 extend from the cylinder body, so as to drive the feeding assembly 3 to move backward;

[0035] Next, when it is necessary to feed downward, the second motor 306 is turned on so that the output shaft of the second motor 306 drives the first rotating disk 311 to rotate, and the particles located at the upper end of the first rotating disk 311 will fall downward through the second feeding chute 312, and the particles will fall downward through the gap between the second rotating disk 313 and the second trough body 303. The motor 310 is turned on to rotate the second rotating disk 313, and the position of the stopper 314 can be changed, thereby forming an annular feeding, which is convenient for quickly filling the particles into the annular mold;

[0036] After the feeding is completed, the moving component 1 is turned on to make the pushing component 2 move forward, and the pushing component 2 is turned on to make the loading component 3 move forward. When the loading component 3 is aligned with the feeding component 5, material can be added quickly again. When the feeding component 3 needs to be maintained, the third electric cylinder 401 is turned on to make the lifting block 402 move upward, so that the feeding component 5 can be quickly lifted and lowered, which is convenient for lifting the feeding component 5 upward, thereby facilitating the maintenance of the loading component 3.

[0037] Through the above steps, when in use, the rubber mixture particles are injected into the loading component 3 through the feeding component 5, and then the feeding component 5 is turned on to push the particles so that the particles can fall into the loading component 3 more evenly, and then the moving component 1 is turned on to make the pushing component 2 move backward, and then the pushing component 2 is turned on to push the loading component 3 backward, and the particles in the loading component 3 will fall into the mold through the pushing component 2, and then the moving component 1 is turned on to make the pushing component 2 move forward, and the pushing component 2 is turned on to make the loading component 3 move forward. When the loading component 3 and the feeding component 5 are aligned, material can be added quickly again, which solves the problem that the feeding device in the prior art is not convenient for quickly injecting the rubber mixture particles into the mold, and the feeding mechanism is difficult to fill quickly after the rubber mixture particles are fed.

[0038] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. A feeding device for a rubber tire molding vulcanizer, comprising a moving assembly (1); characterized in that: The invention also comprises a pushing assembly (2), a feeding assembly (3), a lifting assembly (4) and a feeding assembly (5); the upper end of the moving assembly (1) is provided with a pushing assembly (2) for pushing; the feeding assembly (3) for feeding is provided on the pushing assembly (2); the lifting assembly (4) for lifting the feeding assembly (5) is also provided on the pushing assembly (2); and the feeding assembly (5) for pushing particles in the feeding assembly (3) is provided on the lifting assembly (4).

2. A feeding device for a rubber tire molding vulcanizer according to claim 1, characterized in that: The moving assembly (1) comprises a bearing platform (101), a first U-shaped plate (102), a first bearing seat (103), a first motor (104), a screw (105), a second bearing seat (106), a threaded sleeve (107) and a moving block (108); the first U-shaped plate (102) is fixedly connected to the upper end of the bearing platform (101); the first bearing seat (103) and the second bearing seat (106) are fixedly connected to the upper end of the first U-shaped plate (102); the first motor (104) is fixedly connected to the front end of the first bearing seat (103); the rear end of the output shaft of the first motor (104) passes through the first bearing seat (103) and is fixedly connected to the screw (105); the rear end outer wall of the screw (105) is in contact with the inner wall of the second bearing seat (106); the threaded sleeve (107) is movably mounted on the outer wall of the screw (105); and the moving block (108) is fixedly connected to the outer wall of the threaded sleeve (107).

3. A feeding device for a rubber tire molding vulcanizer according to claim 1, characterized in that: The push assembly (2) comprises a second U-shaped plate (201), a first electric cylinder (202) and a first material discharge chute (203); the second U-shaped plate (201) is fixedly connected to the upper end of the moving block (108); the lower end surface of the second U-shaped plate (201) is fitted to the upper end surface of the first U-shaped plate (102); and the first electric cylinder (202) is fixedly connected to the upper end of the second U-shaped plate (201).

4. A feeding device for a rubber tire molding vulcanizer according to claim 1, characterized in that: The loading assembly (3) comprises a moving frame (301), a first trough body (302), a second trough body (303), a first connecting block (304), a third trough body (305), a second motor (306), a fixed plate (307), a protective plate (308), a groove (309), a motor (310), a first rotating plate (311), a second unloading trough (312), a second rotating plate (313) and a stopper (314); an output shaft of the first electric cylinder (202) The rear end is fixedly connected to a moving frame (301); the upper end of the moving frame (301) is provided with a first slot (302); the lower end of the first slot (302) is penetrated by a second slot (303); the second slot (303) is a cylindrical slot; the front and rear ends of the inner wall of the moving frame (301) are both fixedly connected to first connecting blocks (304); one end of the two first connecting blocks (304) close to the center of the moving frame (301) is fixedly connected to a second motor (306); the two first connecting blocks (30 4) is fixedly connected to a fixed disk (307) at the lower end; the fixed disk (307) is annular; the inner wall of the fixed disk (307) is in contact with the outer wall of the second motor (306); the upper end of the second motor (306) is fixedly connected to a protective disk (308); the lower end of the output shaft of the second motor (306) is provided with a groove (309); the inner wall of the groove (309) is fixedly connected to a motor (310); the lower end of the output shaft of the second motor (306) is fixedly connected to a first rotating disk (311); the first rotating disk (312) is fixedly connected to the lower end of the output shaft of the second motor (306); The upper and lower ends of the disk (311) are penetrated by a second material discharge chute (312); the lower end of the output shaft of the motor (310) penetrates the first rotating disk (311) and is fixedly connected to the second rotating disk (313); a stopper (314) is fixedly connected to the outer wall of the second rotating disk (313); one end of the stopper (314) away from the center of the second rotating disk (313) is in contact with the inner wall of the second trough body (303); and the top surface area of ​​the stopper (314) is larger than the top surface area of ​​the second material discharge chute (312).

5. A feeding device for a rubber tire molding vulcanizer according to claim 4, characterized in that: The outer wall of the first rotating disk (311) fits the inner wall of the second trough body (303); the outer diameter of the second rotating disk (313) is smaller than the inner diameter of the second trough body (303).

6. A feeding device for a rubber tire molding vulcanizer according to claim 1, characterized in that: The lifting assembly (4) comprises a third electric cylinder (401) and a lifting block (402); the third electric cylinder (401) is fixedly connected to both left and right ends of the second U-shaped plate (201); and the lifting block (402) is fixedly connected to the upper end of the output shaft of the third electric cylinder (401).

7. A feeding device for a rubber tire molding vulcanizer according to claim 1, characterized in that: The feeding assembly (5) comprises a movable frame (501), a second connecting block (502), a fourth motor (503) and a fixed arm (504); the movable frame (501) is fixedly connected to one end of the two lifting blocks (402) close to each other; the second connecting block (502) is fixedly connected to the inner wall of the movable frame (501); the fourth motor (503) is fixedly connected to the inner wall of the second connecting block (502); the fixed arm (504) is fixedly connected to the lower end of the output shaft of the fourth motor (503); the lower end surface of the movable frame (501) is in contact with the upper end surface of the movable frame (301); the inner wall of the movable frame (501) and the inner wall of the movable frame (301) are in the same plane; the lower end surface of the fixed arm (504) is in contact with the upper end surface of the protective plate (308).

Images